Spoilers
 on all five books!!!

Professor Quirrell, in his absurd turban, was talking to a teacher with greasy black hair, a hooked nose, and sallow skin.

It happened very suddenly. The hook-nosed teacher looked past Quirrell's turban straight into Harry's eyes -- and a sharp, hot pain shot across the scar on Harry's forehead.

"Ouch!" Harry clapped a hand to his head.

"What is it?" asked Percy.

"N-nothing."

The pain had gone as quickly as it had come. Harder to shake off was the feeling Harry had gotten from the teacher's look -- a feeling that he didn't like Harry at all.

"Who's that teacher talking to Professor Quirrell?" he asked Percy.

"Oh, you know Quirrell already, do you? No wonder he's looking so nervous, that's Professor Snape. He teaches Potions, but he doesn't want to -- everyone knows he's after Quirrell's job. Knows an awful lot about the Dark Arts, Snape."

Harry watched Snape for a while, but Snape didn't look at him again.

"Double Potions with the Slytherins," said Ron. "Snape's Head of Slytherin House. They say he always favors them -- we'll be able to see if it's true."

At the start-of-term banquet, Harry had gotten the idea that Professor Snape disliked him. By the end of the first Potions lesson, he knew he'd been wrong. Snape didn't dislike Harry -- he hated him.

Potions lessons took place down in one of the dungeons. It was colder here than up in the main castle, and would have been quite creepy enough without the pickled animals floating in glass jars all around the walls.

Snape, like Flitwick, started the class by taking the roll call, and like Flitwick, he paused at Harry's name.

"Ah, Yes," he said softly, "Harry Potter. Our new -- celebrity."

Draco Malfoy and his friends Crabbe and Goyle sniggered behind their hands. Snape finished calling the names and looked up at the class. His eyes were black like Hagrid's, but they had none of Hagrid's warmth.

They were cold and empty and made you think of dark tunnels.

"You are here to learn the subtle science and exact art of potion-making," he began. He spoke in barely more than a whisper, but they caught every word -- like Professor McGonagall, Snape had the gift of keeping a class silent without effort. "As there is little foolish wand-waving here, many of you will hardly believe this is magic. I don't expect you will really understand the beauty of the softly simmering cauldron with its shimmering fumes, the delicate power of liquids that creep through human veins, bewitching the mind, ensnaring the senses.... I can teach you how to bottle fame, brew glory, even stopper death -- if you aren't as big a bunch of dunderheads as I usually have to teach."

More silence followed this little speech. Harry and Ron exchanged looks with raised eyebrows. Hermione Granger was on the edge of her seat and looked desperate to start proving that she wasn't a dunderhead.

"Potter!" said Snape suddenly. "What would I get if I added powdered root of asphodel to an infusion of wormwood?"

Powdered root of what to an infusion of what? Harry glanced at Ron, who looked as stumped as he was; Hermione's hand had shot into the air.

"I don't know, sit," said Harry.

Snape's lips curled into a sneer.

"Tut, tut -- fame clearly isn't everything."

He ignored Hermione's hand.

"Let's try again. Potter, where would you look if I told you to find me a bezoar?"

Hermione stretched her hand as high into the air as it would go without her leaving her seat, but Harry didn't have the faintest idea what a bezoar was. He tried not to look at Malfoy, Crabbe, and Goyle, who were shaking with laughter.

"I don't know, sir." 

"Thought you wouldn't open a book before coming, eh, Potter?" Harry forced himself to keep looking straight into those cold eyes. He had looked through his books at the Dursleys', but did Snape expect him to remember everything in One Thousand Magical Herbs and Fungi?

Snape was still ignoring Hermione's quivering hand.

"What is the difference, Potter, between monkshood and wolfsbane?"

At this, Hermione stood up, her hand stretching toward the dungeon ceiling.

"I don't know," said Harry quietly. "I think Hermione does, though, why don't you try her?"

A few people laughed; Harry caught Seamus's eye, and Seamus winked. Snape, however, was not pleased.

"Sit down," he snapped at Hermione. "For your information, Potter, asphodel and wormwood make a sleeping potion so powerful it is known as the Draught of Living Death. A bezoar is a stone taken from the stomach of a goat and it will save you from most poisons. As for monkshood and wolfsbane, they are the same plant, which also goes by the name of aconite. Well? Why aren't you all copying that down?"

There was a sudden rummaging for quills and parchment. Over the noise, Snape said, "And a point will be taken from Gryffindor House for your cheek, Potter."

Things didn't improve for the Gryffindors as the Potions lesson continued. Snape put them all into pairs and set them to mixing up a simple potion to cure boils. He swept around in his long black cloak, watching them weigh dried nettles and crush snake fangs, criticizing almost everyone except Malfoy, whom he seemed to like. He was just telling everyone to look at the perfect way Malfoy had stewed his horned slugs when clouds of acid green smoke and a loud hissing filled the dungeon. Neville had somehow managed to melt Seamus's cauldron into a twisted blob, and their potion was seeping across the stone floor, burning holes in people's shoes. Within seconds, the whole class was standing on their stools while Neville, who had been drenched in the potion when the cauldron collapsed, moaned in pain as angry red boils sprang up all over his arms and legs.

"Idiot boy!" snarled Snape, clearing the spilled potion away with one wave of his wand. "I suppose you added the porcupine quills before taking the cauldron off the fire?"

Neville whimpered as boils started to pop up all over his nose.

"Take him up to the hospital wing," Snape spat at Seamus. Then he rounded on Harry and Ron, who had been working next to Neville.

"You -- Potter -- why didn't you tell him not to add the quills? Thought he'd make you look good if he got it wrong, did you? That's another point you've lost for Gryffindor."

This was so unfair that Harry opened his mouth to argue, but Ron kicked him behind their cauldron.

"Don't push it," he muttered, "I've heard Snape can turn very nasty."

Harry told Hagrid about Snape's lesson. Hagrid, like Ron, told Harry not to worry about it, that Snape liked hardly any of the students.

"But he seemed to really hate me."

"Rubbish!" said Hagrid. "Why should he?"

Yet Harry couldn't help thinking that Hagrid didn't quite meet his eyes when he said that.

I shall speak to Professor Dumbledore and see if we can't bend the first-year rule. Heaven knows, we need a better team than last year. Flattened in that last match by Slytherin, I couldn't look Severus Snape in the face for weeks...."

Peering around it, however, they saw not Percy but Snape. He crossed the corridor and disappeared from view.

"What's he doing?" Harry whispered. "Why isn't he down in the dungeons with the rest of the teachers?"

"Search me."

Quietly as possible, they crept along the next corridor after Snape's fading footsteps.

"He's heading for the third floor," Harry said, but Ron held up his hand.

 A moment later, Professor McGonagall had come bursting into the room, closely followed by Snape, with Quirrell bringing up the rear. Quirrell took one look at the troll, let out a faint whimper, and sat quickly down on a toilet, clutching his heart.

Snape bent over the troll. Professor McGonagall was looking at Ron and Harry. Harry had never seen her look so angry. Her lips were white.

Hopes of winning fifty points for Gryffindor faded quickly from Harry's mind.

"What on earth were you thinking of?" said Professor McGonagall, with cold fury in her voice. Harry looked at Ron, who was still standing with his wand in the air. "You're lucky you weren't killed. Why aren't you in your dormitory?"

Snape gave Harry a swift, piercing look. Harry looked at the floor. He wished Ron would put his wand down.

Hermione hung her head. Harry was speechless. Hermione was the last person to do anything against the rules, and here she was, pretending she had, to get them out of trouble. It was as if Snape had started handing out sweets.

... three of them were out in the freezing courtyard during break, and she had conjured them up a bright blue fire that could be carried around in a jam jar. They were standing with their backs to it, getting warm, when Snape crossed the yard. Harry noticed at once that Snape was limping. Harry, Ron, and Hermione moved closer together to block the fire from view; they were sure it wouldn't be allowed. Unfortunately, something about their guilty faces caught Snape's eye. He limped over. He hadn't seen the fire, but he seemed to be looking for a reason to tell them off anyway.

"What's that you've got there, Potter?"

It was Quidditch Through the Ages. Harry showed him.

"Library books are not to be taken outside the school," said Snape.

"Give it to me. Five points from Gryffindor."

"He's just made that rule up," Harry muttered angrily as Snape limped away. "Wonder what's wrong with his leg?"

"Dunno, but I hope it's really hurting him," said Ron bitterly.

(...)

Harry felt restless. He wanted Quidditch Through the Ages back, to take his mind off his nerves about tomorrow. Why should he be afraid of Snape? Getting up, he told Ron and Hermione he was going to ask Snape if he could have it.

"Better you than me," they said together, but Harry had an idea that Snape wouldn't refuse if there were other teachers listening.

He made his way down to the staffroom and knocked. There was no answer. He knocked again. Nothing.

Perhaps Snape had left the book in there? It was worth a try. He pushed the door ajar and peered inside -- and a horrible scene met his eyes. Snape and Filch were inside, alone. Snape was holding his robes above his knees. One of his legs was bloody and mangled. Filch was handing Snape bandages.

"Blasted thing*," Snape was saying. "How are you supposed to keep your eyes on all three heads at once?"

Harry tried to shut the door quietly, but --

"POTTER!"

Snape's face was twisted with fury as he dropped his robes quickly to hide his leg. Harry gulped.

"I just wondered if I could have my book back."

"GET OUT! OUT!"

Harry left, before Snape could take any more points from Gryffindor. He sprinted back upstairs.

"Can't have," Hagrid said, his voice shaking. "Can't nothing interfere with a broomstick except powerful Dark magic -- no kid could do that to a Nimbus Two Thousand."

At these words, Hermione seized Hagrid's binoculars, but instead of looking up at Harry, she started looking frantically at the crowd.

"What are you doing?" moaned Ron, gray-faced.

"I knew it," Hermione gasped, "Snape -- look."

Ron grabbed the binoculars. Snape was in the middle of the stands opposite them. He had his eyes fixed on Harry and was muttering nonstop under his breath.

"He's doing something -- jinxing the broom," said Hermione.

Hermione had fought her way across to the stand where Snape stood, and was now racing along the row behind him; she didn't even stop to say sorry as she knocked Professor Quirrell headfirst into the row in front. Reaching Snape, she crouched down, pulled out her wand, and whispered a few, well- chosen words. Bright blue flames shot from her wand onto the hem of Snape's robes.

It took perhaps thirty seconds for Snape to realize that he was on fire. A sudden yelp told her she had done her job. Scooping the fire off him into a little jar in her pocket, she scrambled back along the row -- Snape would never know what had happened. It was enough. Up in the air, Harry was suddenly able to clamber back on to his broom.

"But Snape's trying to steal it."

"Rubbish," said Hagrid again. "Snape's a Hogwarts teacher, he'd do nothin' of the sort."

"So why did he just try and kill Harry?" cried Hermione.

The afternoon's events certainly seemed to have changed her mind about Snape. I know a jinx when I see one, Hagrid, I've read all about them! You've got to keep eye contact, and Snape wasn't blinking at all, I saw him!"

"I'm tellin' yeh, yer wrong!" said Hagrid hotly. "I don' know why Harry's broom acted like that, but Snape wouldn' try an' kill a student!  

No one could wait for the holidays to start. (...) Worst of all were Professor Snape's classes down in the dungeons, where their breath rose in a mist before them and they kept as close as possible to their hot cauldrons.

Ron dived at Malfoy just as Snape came up the stairs.

"WEASLEY!"

Ron let go of the front of Malfoy's robes.

"He was provoked, Professor Snape," said Hagrid, sticking his huge hairy face out from behind the tree. "Malfoy was insultin' his family."

"Be that as it may, fighting is against Hogwarts rules, Hagrid," said Snape silkily. "Five points from Gryffindor, Weasley, and be grateful it isn't more. Move along, all of you."

Malfoy, Crabbe, and Goyle pushed roughly past the tree, scattering needles everywhere and smirking.

"I'll get him," said Ron, grinding his teeth at Malfoy's back, "one of these days, I'll get him --"

"I hate them both," said Harry, "Malfoy and Snape."

"You asked me to come directly to you, Professor, if anyone was wandering around at night, and somebody's been in the library Restricted Section."

Harry felt the blood drain out of his face. Wherever he was, Filch must know a shortcut, because his soft, greasy voice was getting nearer, and to his horror, it was Snape who replied, "The Restricted Section? Well, they can't be far, we'll catch them."

"Will you stop messing around!" he yelled. "That's exactly the sort of thing that'll lose us the match! Snape's refereeing this time, and he'll be looking for any excuse to knock points off Gryffindor!"

George Weasley really did fall off his broom at these words. "Snape's refereeing?" he spluttered through a mouthful of mud. "When's he ever refereed a Quidditch match? He's not going to be fair if we might overtake Slytherin."

The rest of the team landed next to George to complain, too. "It's not my fault," said Wood. "We've just got to make sure we play a clean game, so Snape hasn't got an excuse to pick on us." Which was all very well, thought Harry, but he had another reason for not wanting Snape near him while he was playing Quidditch....

"A stone that makes gold and stops you from ever dying!" said Harry. "No wonder Snape's after it! Anyone would want it."

Harry didn't know whether he was imagining it or not, but he seemed to keep running into Snape wherever he went. At times, he even wondered whether Snape was following him, trying to catch him on his own. Potions lessons were turning into a sort of weekly torture, Snape was so horrible to Harry. Could Snape possibly know they'd found out about the Sorcerer's Stone? Harry didn't see how he could -- yet he sometimes had the horrible feeling that Snape could read minds.

"Dumbledore?" he said, dashing to the door to make sure. Fred was right. There was no mistaking that silver beard.

Harry could have laughed out loud with relief He was safe. There was simply no way that Snape would dare to try to hurt him if Dumbledore was watching.

Perhaps that was why Snape was looking so angry as the teams marched onto the field, something that Ron noticed, too.

"I've never seen Snape look so mean," he told Hermione. "Look -they're off Ouch!"

Ron didn't answer; Snape had just awarded Hufflepuff a penalty because George Weasley had hit a Bludger at him. Hermione, who had all her fingers crossed in her lap, was squinting fixedly at Harry, who was circling the game like a hawk, looking for the Snitch.

"You know how I think they choose people for the Gryffindor team?" said Malfoy loudly a few minutes later, as Snape awarded Hufflepuff another penalty for no reason at all. "It's people they feel sorry for. See, there's Potter, who's got no parents, then there's the Weasleys, who've got no money -- you should be on the team, Longbottom, you've got no brains."

Harry jumped off his broom, a foot from the ground. He couldn't believe it. He'd done it -- the game was over; it had barely lasted five minutes. As Gryffindors came spilling onto the field, he saw Snape land nearby, white-faced and tight-lipped -- then Harry felt a hand on his shoulder and looked up into Dumbledore's smiling face.

"Well done," said Dumbledore quietly, so that only Harry could hear.

"Nice to see you haven't been brooding about that mirror... been keeping busy... excellent..."

Snape spat bitterly on the ground.

And speaking of Snape...

A hooded figure came swiftly down the front steps of the castle. Clearly not wanting to be seen, it walked as fast as possible toward the forbidden forest. Harry's victory faded from his mind as he watched. He recognized the figure's prowling walk. Snape, sneaking into the forest while everyone else was at dinner -- what was going on?

Harry jumped back on his Nimbus Two Thousand and took off. Gliding silently over the castle he saw Snape enter the forest at a run. He followed.

The trees were so thick he couldn't see where Snape had gone. He flew in circles, lower and lower, brushing the top branches of trees until he heard voices. He glided toward them and landed noiselessly in a towering beech tree.

He climbed carefully along one of the branches, holding tight to his broomstick, trying to see through the leaves. Below, in a shadowy clearing, stood Snape, but he wasn't alone. Quirrell was there, too.

Harry couldn't make out the look on his face, but he was stuttering worse than ever. Harry strained to catch what they were saying.

"... d-don't know why you wanted t-t-to meet here of all p-places, Severus..."

"Oh, I thought we'd keep this private," said Snape, his voice icy.

"Students aren't supposed to know about the Philosopher's Stone, after all."

Harry leaned forward. Quirrell was mumbling something. Snape interrupted him.

"Have you found out how to get past that beast of Hagrid's yet?"

"B-b-but Severus, I --"

"You don't want me as your enemy, Quirrell," said Snape, taking a step toward him.

"I-I don't know what you

"You know perfectly well what I mean."

An owl hooted loudly, and Harry nearly fell out of the tree. He steadied himself in time to hear Snape say, "-- your little bit of hocus-pocus. I'm waiting."

"B-but I d-d-don't --"

"Very well," Snape cut in. "We'll have another little chat soon, when you've had time to think things over and decided where your loyalties lie."

He threw his cloak over his head and strode out of the clearing. It was almost dark now, but Harry could see Quirrell, standing quite still as though he was petrified.

"So we were right, it is the Philosopher's Stone, and Snape's trying to force Quirrell to help him get it. He asked if he knew how to get past Fluffy - and he said something about Quirrell's 'hocus pocus-- I reckon there are other things guarding the stone apart from Fluffy, loads of enchantments, probably, and Quirrell would have done some anti-Dark Arts spell that Snape needs to break through --"

"So you mean the Stone's only safe as long as Quirrell stands up to Snape?" said Hermione in alarm.

"It'll be gone by next Tuesday," said Ron.

Every time they passed the third-floor corridor, Harry, Ron, and Hermione would press their ears to the door to check that Fluffy was still growling inside. Snape was sweeping about in his usual bad temper, which surely meant that the Stone was still safe. Whenever Harry passed Quirrell these days he gave him an encouraging sort of smile, and Ron had started telling people off for laughing at Quirrell's stutter.

"Well, I don' s'pose it could hurt ter tell yeh that... let's see... he borrowed Fluffy from me... then some o' the teachers did enchantments...

Professor Sprout -- Professor Flitwick -- Professor McGonagall --" he ticked them off on his fingers, "Professor Quirrell -- an' Dumbledore himself did somethin', o' course. Hang on, I've forgotten someone. Oh yeah, Professor Snape."

"Snape?"

"Yeah -- yer not still on abou' that, are yeh? Look, Snape helped protect the Stone, he's not about ter steal it."

Harry knew Ron and Hermione were thinking the same as he was. If Snape had been in on protecting the Stone, it must have been easy to find out how the other teachers had guarded it. He probably knew everything -- except, it seemed, Quirrell's spell and how to get past Fluffy.

"Snape wants the stone for Voldemort... and Voldemort's waiting in the forest... and all this time we thought Snape just wanted to get rich...."

Snape made them all nervous, breathing down their necks while they tried to remember how to make a Forgetfulness potion.

"It's tonight," said Harry, once he was sure Professor McGonagall was out of earshot. "Snape's going through the trapdoor tonight. He's found out everything he needs, and now he's got Dumbledore out of the way. He sent that note, I bet the Ministry of Magic will get a real shock when Dumbledore turns up."

"But what can we --"

Hermione gasped. Harry and Ron wheeled round. Snape was standing there.

"Good afternoon," he said smoothly.

They stared at him.

"You shouldn't be inside on a day like this," he said, with an odd, twisted smile.

"We were --" Harry began, without any idea what he was going to say.

"You want to be more careful," said Snape. "Hanging around like this, people will think you're up to something. And Gryffindor really can't afford to lose any more points, can it?"

Harry flushed. They turned to go outside, but Snape called them back.

"Be warned, Potter -- any more nighttime wanderings and I will personally make sure you are expelled. Good day to you."

He strode off in the direction of the staffroom.

"I'm sorry, Harry!" she wailed. "Snape came out and asked me what I was doing, so I said I was waiting for Flitwick, and Snape went to get him, and I've only just got away, I don't know where Snape went."

He pulled open the next door, both of them hardly daring to look at what came next - but there was nothing very frightening in here, just a table with seven differently shaped bottles standing on it in a line.

"Snape's," said Harry. "What do we have to do?"

They stepped over the threshold, and immediately a fire sprang up behind them in the doorway. It wasn't ordinary fire either; it was purple. At the same instant, black flames shot up in the doorway leading onward.

They were trapped.

"Look!" Hermione seized a roll of paper lying next to the bottles. Harry looked over her shoulder to read it:

Danger lies before you, while safety lies behind,
Two of us will help you, which ever you would find,
One among us seven will let you move ahead,
Another will transport the drinker back instead,
Two among our number hold only nettle wine,
Three of us are killers, waiting bidden in line.
Choose, unless you wish to stay here forevermore,

To help you in your choice, we give you these clues four:
First, however slyly the poison tries to hide
You will always find some on nettle wine's left side;
Second, different are those who stand at either end,
But if you would move onward, neither is your friend;
Third, as you see clearly, all are different size,
Neither dwarf nor giant holds death in their insides;
Fourth, the second left and the second on the right
Are twins once you taste them, though different at first sight.

Hermione let out a great sigh and Harry, amazed, saw that she was smiling, the very last thing he felt like doing.

"Brilliant," said Hermione. "This isn't magic -- it's logic -- a puzzle. A lot of the greatest wizards haven't got an ounce of logic, they'd be stuck in here forever."

"But so will we, won't we?" "Of course not," said Hermione. "Everything we need is here on this paper. Seven bottles: three are poison; two are wine; one will get us safely through the black fire, and one will get us back through the purple."

"But how do we know which to drink?"

"Give me a minute."

"But I thought -- Snape --"

"Severus?" Quirrell laughed, and it wasn't his usual quivering treble, either, but cold and sharp. "Yes, Severus does seem the type, doesn't he? So useful to have him swooping around like an overgrown bat. Next to him, who would suspect p-p-poor, st-stuttering P-Professor Quirrell?"

Harry couldn't take it in. This couldn't be true, it couldn't.

"But Snape tried to kill me!"

"No, no, no. I tried to kill you. Your friend Miss Granger accidentally knocked me over as she rushed to set fire to Snape at that Quidditch match. She broke my eye contact with you. Another few seconds and I'd have got you off that broom. I'd have managed it before then if Snape hadn't been muttering a countercurse, trying to save you."

"Snape was trying to save me?"

"Of course," said Quirrell coolly. "Why do you think he wanted to referee your next match? He was trying to make sure I didn't do it again. Funny, really... he needn't have bothered. I couldn't do anything with Dumbledore watching. All the other teachers thought Snape was trying to stop Gryffindor from winning, he did make himself unpopular...and what a waste of time, when after all that, I'm going to kill you tonight."

"You let the troll in?"

"Certainly. I have a special gift with trolls -- you must have seen what I did to the one in the chamber back there? Unfortunately, while everyone else was running around looking for it, Snape, who already suspected me, went straight to the third floor to head me off -- and not only did my troll fail to beat you to death, that three-headed dog didn't even manage to bite Snape's leg off properly.

"I saw you and Snape in the forest --" he blurted out. "Yes," said Quirrell idly, walking around the mirror to look at the back. "He was on to me by that time, trying to find out how far I'd got.

He suspected me all along. Tried to frighten me - as though he could, when I had Lord Voldemort on my side...."

"But Snape always seemed to hate me so much."

"Oh, he does," said Quirrell casually, "heavens, yes. He was at Hogwarts with your father, didn't you know? They loathed each other. But he never wanted you dead."

"Quirrell said Snape --"

"Professor Snape, Harry." "Yes, him -- Quirrell said he hates me because he hated my father. Is that true?"

"Well, they did rather detest each other. Not unlike yourself and Mr. Malfoy. And then, your father did something Snape could never forgive."

"What?"

"He saved his life."

"What?"

"Yes..." said Dumbledore dreamily. "Funny, the way people's minds work, isn't it? Professor Snape couldn't bear being in your father's debt....

I do believe he worked so hard to protect you this year because he felt that would make him and your father even. Then he could go back to hating your father's memory in peace...."

Harry tried to understand this but it made his head pound, so he stopped.

He clapped his hands. In an instant, the green hangings became scarlet and the silver became gold; the huge Slytherin serpent vanished and a towering Gryffindor lion took its place. Snape was shaking Professor McGonagall's hand, with a horrible, forced smile. He caught Harry's eye and Harry knew at once that Snape's feelings toward him hadn't changed one jot. This didn't worry Harry. It seemed as though life would be back to normal next year, or as normal as it ever was at Hogwarts.