Harry pushed it open.

A disgusting smell filled their nostrils, making both of them pull their robes up over their noses. Eyes watering, they saw, flat on the floor in front of them, a troll even larger than the one they had tackled, out cold with a bloody lump on its head.

'I'm glad we didn't have to fight that one,' Harry whispered, as they stepped carefully over one of its massive legs. 'Come on, I can't breathe.'

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 onwards. 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, whichever 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 hidden in line.

Choose, unless you wish to stay here for evermore, 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 onwards, 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 for ever.'

'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.'

Hermione read the paper several times. Then she walked up and down the line of bottles, muttering to herself and pointing at them. At last, she clapped her hands.

'Got it,' she said. 'The smallest bottle will get us through the black fire towards the Stone.'

Harry looked at the tiny bottle.

'There's only enough there for one of us,' he said. 'That's hardly one swallow.'

They looked at each other.

'Which one will get you back through the purple flames?'

Hermione pointed at a rounded bottle at the right end of the line.

'You drink that,' said Harry. 'No, listen get back and get Ron grab brooms from the flying-key room, they'll get you out of the trapdoor and past Fluffy go straight to the owlery and send Hedwig to Dumbledore, we need him. I might be able to hold Snape off for a while, but I'm no match for him really.'

'But Harry what if You-Know-Who's with him?'

'Well I was lucky once, wasn't I?' said Harry, pointing at his scar. 'I might get lucky again.'

Hermione's lip trembled and she suddenly dashed at Harry and threw her arms around him.

'Hermione!'

'Harry you're a great wizard, you know.'

'I'm not as good as you,' said Harry, very embarrassed, as she let go of him.

'Me!' said Hermione. 'Books! And cleverness! There are more important things friendship and bravery and oh Harry be careful!'

'You drink first,' said Harry. 'You are sure which is which, aren't you?'

'Positive,' said Hermione. She took a long drink from the round bottle at the end and shuddered.

'It's not poison?' said Harry anxiously.

'No but it's like ice.'

'Quick, go, before it wears off.'

'Good luck take care '

'GO!'

Hermione turned and walked straight through the purple fire.

Harry took a deep breath and picked up the smallest bottle. He turned to face the black flames.

'Here I come,' he said and he drained the little bottle in one gulp.

It was indeed as though ice was flooding his body. He put the bottle down and walked forward; he braced himself, saw the black flames licking his body but couldn't feel them for a moment he could see nothing but dark fire then he was on the other side, in the last chamber.

There was already someone there but it wasn't Snape. It wasn't even Voldemort.

- CHAPTER SEVENTEEN*

The Man with Two Faces

It was Quirrell.

'You!' gasped Harry.

Quirrell smiled. His face wasn't twitching at all.

'Me,' he said calmly. 'I wondered whether I'd be meeting you here, Potter.'

'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 counter-curse, 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 winning, he did make himself unpopular ... and what a waste of time, when after all that, I'm going to kill you tonight.'

Quirrell snapped his fingers. Ropes sprang out of thin air and wrapped themselves tightly around Harry.

'You're too nosy to live, Potter. Scurrying around the school at Hallowe'en like that, for all I knew you'd seen me coming to look at what was guarding the Stone.'

'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.

'Now, wait quietly, Potter. I need to examine this interesting mirror.'

It was only then that Harry realised what was standing behind Quirrell. It was the Mirror of Erised.

'This mirror is the key to finding the Stone,' Quirrell murmured, tapping his way around the frame. 'Trust Dumbledore to come up with something like this ... but he's in London ... I'll be far away by the time he gets back ...'

All Harry could think of doing was to keep Quirrell talking and stop him concentrating on the Mirror.

'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 ...'

Quirrell came back out from behind the Mirror and stared hungrily into it.

'I see the Stone ... I'm presenting it to my master ... but where is it?'

Harry struggled against the ropes binding him, but they didn't give. He had to keep Quirrell from giving his whole attention to the Mirror.

'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.'

'But I heard you a few days ago, sobbing I thought Snape was threatening you ...'

For the first time, a spasm of fear flitted across Quirrell's face.

'Sometimes,' he said, 'I find it hard to follow my master's instructions he is a great wizard and I am weak '

'You mean he was there in the classroom with you?' Harry gasped.

'He is with me wherever I go,' said Quirrell quietly. 'I met him when I travelled around the world. A foolish young man I was then, full of ridiculous ideas about good and evil. Lord Voldemort showed me how wrong I was. There is no good and evil, there is only power, and those too weak to seek it ... Since then, I have served him faithfully, although I have let him down many times. He has had to be very hard on me.' Quirrell shivered suddenly. 'He does not forgive mistakes easily. When I failed to steal the Stone from Gringotts, he was most displeased. He punished me ... decided he would have to keep a closer watch on me ...'

Quirrell's voice tailed away. Harry was remembering his trip to Diagon Alley how could he have been so stupid? He'd seen Quirrell there that very day, shaken hands with him in the Leaky Cauldron.

Quirrell cursed under his breath.

'I don't understand ... is the Stone inside the Mirror? Should I break it?'

Harry's mind was racing.

What I want more than anything else in the world at the moment, he thought, is to find the Stone before Quirrell does. So if I look in the Mirror, I should see myself finding it which means I'll see where it's hidden! But how can I look without Quirrell realising what I'm up to?

He tried to edge to the left, to get in front of the glass without Quirrell noticing, but the ropes around his ankles were too tight: he tripped and fell over. Quirrell ignored him. He was still talking to himself.

'What does this mirror do? How does it work? Help me, Master!'

And to Harry's horror, a voice answered, and the voice seemed to come from Quirrell himself.

'Use the boy ... Use the boy ...'

Quirrell rounded on Harry.

'Yes Potter come here.'

He clapped his hands once and the ropes binding Harry fell off. Harry got slowly to his feet.

'Come here,' Quirrell repeated. 'Look in the Mirror and tell me what you see.'

Harry walked towards him.

'I must lie,' he thought desperately. 'I must look and lie about what I see, that's all.'

Quirrell moved close behind him. Harry breathed in the funny smell that seemed to come from Quirrell's turban. He closed his eyes, stepped in front of the Mirror and opened them again.

He saw his reflection, pale and scared-looking at first. But a moment later, the reflection smiled at him. It put its hand into its pocket and pulled out a blood-red stone. It winked and put the Stone back in its pocket and as it did so, Harry felt something heavy drop into his real pocket. Somehow incredibly he'd got the Stone.

'Well?' said Quirrell impatiently. 'What do you see?'

Harry screwed up his courage.

'I see myself shaking hands with Dumbledore,' he invented. 'I I've won the House Cup for Gryffindor.'

Quirrell cursed again.