Things couldn't have been worse.

Filch took them down to Professor McGonagall's study on the first floor, where they sat and waited without saying a word to each other. Hermione was trembling. Cassie couldn't see how they were going to get out of trouble this time. They were cornered. How could they have been so stupid as to forget the cloak? There was no reason on earth that Professor McGonagall would accept for their being out of bed and creeping around the school in the dead of night, let alone being up the tallest astronomy tower, which was out-of-bounds except for classes. Add Norbert and the invisibility cloak, and they might as well be packing their bags already.

Had Cassie thought that things couldn't have been worse? She was wrong. When Professor McGonagall appeared, she was leading Neville.

"Harry!" Neville burst out, the moment he saw the other three. "I was trying to find you to warn you, I heard Malfoy saying he was going to catch you, he said you had a drag-"

Cassie shook her head violently to shut Neville up, but Professor McGonagall had seen. She looked more likely to breathe fire than Norbert as she towered over the four of them.

"I would never have believed it of any of you. Mr. Filch says you were up in the astronomy tower. It's one o'clock in the morning. Explain yourselves."

It was the first time Hermione had ever failed to answer a teacher's question. She was staring at her slippers, as still as a statue.

"I think I've got a good idea of what's been going on," said Professor McGonagall. "It doesn't take a genius to work it out. You fed Draco Malfoy some cock-and-bull story about a dragon, trying to get him out of bed and into trouble. I've already caught him. I suppose you think it's funny that Longbottom here heard the story and believed it, too?"

"I'm disgusted," said Professor McGonagall. "Five students out of bed in one night! I've never heard of such a thing before! You, Miss Granger, I thought you had more sense. As for you two, Mr. Potter and Miss Black, I thought Gryffindor meant more to you than this. All four of you will receive detentions, yes, you too, Mr. Longbottom, nothing gives you the right to walk around school at night, especially these days, it's very dangerous ,and fifty points will be taken from Gryffindor."

"Fifty ?" Harry gasped.

"Fifty points each," said Professor McGonagall, breathing heavily through her long, pointed nose.

"Professor, please.." begged Cassie.

"You can't.." began Harry

"Don't tell me what I can and can't do, Potter, Black. Now get back to bed, all of you. I've never been more ashamed of Gryffindor students."

Two hundred points lost. That put Gryffindor in last place. In one night, they'd ruined any chance Gryffindor had had for the house cup. Cassie felt as though the bottom had dropped out of her stomach. How could they ever make up for this?

At first, Gryffindors passing the giant hourglasses that recorded the house points the next day thought there'd been a mistake. How could they suddenly have two hundred points fewer than yesterday? And then the story started to spread: Harry Potter, the famous Harry Potter, their hero of two Quidditch matches, had lost them all those points, him and a couple of other stupid first years.

From being one of the most popular and admired people at the school, Harry was suddenly the most hated. Even Ravenclaws and Hufflepuffs turned on him, because everyone had been longing to see Slytherin lose the house cup. Everywhere Harry went, people pointed and didn't trouble to lower their voices as they insulted him. Slytherins, on the other hand, clapped as he walked past them, whistling and cheering, "Thanks Potter, we owe you one!"

Only Ron, Cassie and Hermione stood by him.

"They'll all forget this in a few weeks. Fred and George have lost loads of points in all the time they've been here, and people still like them." said Ron

"They've never lost two hundred points in one go, though, have they?" said Harry miserably.

"Well, no," Ron admitted.

Hermione, Cassie and Neville were suffering, too. They didn't have as bad a time as Harry, because they weren't as well-known, but nobody would speak to them, either. Hermione had stopped drawing attention to herself in class, keeping her head down and working in silence.

Cassie was almost glad that the exams weren't far away. All the studying she had to do kept her mind off her misery. She, Harry, Ron, and Hermione kept to themselves, working late into the night, trying to remember the ingredients in complicated potions, learn charms and spells by heart, memorize the dates of magical discoveries and goblin rebellions...

Cassie, Ron and Hermione were in the library. Hermuone was testing the other two on Astronomy.

"How many moons does Jupit-" Hermione was cut off by Harry hurring over to their table.

He quickly explained about how he'd heard Quirrel giving in to Snape

"That's that, then!" said Cassie, discarding her map of the solar system "If Quirrell's told Snape how to break his Anti-Dark Force spell"

"There's still Fluffy, though," Hermione pointed out.

"Maybe Snape's found out how to get past him without asking Hagrid," said Ron, looking up at the thousands of books surrounding them. "I bet there's a book somewhere in here telling you how to get past a giant three-headed dog. So what do we do, Harry?"

"Go to Dumbledore." said Hermione "That's what we should have done ages ago. If we try anything ourselves we'll be thrown out for sure."

"But we've got no proof!" said Harry. "Quirrell's too scared to back us up. Snape's only got to say he doesn't know how the troll got in at Halloween and that he was nowhere near the third floor, who do you think they'll believe, him or us? It's not exactly a secret we hate him, Dumbledore'll think we made it up to get him sacked. Filch wouldn't help us if his life depended on it, he's too friendly with Snape, and the more students get thrown out, the better, he'll think. And don't forget, we're not supposed to know about the Stone or Fluffy. That'll take a lot of explaining."

"If we just do a bit of poking around.." began Ron

"No," said Harry flatly, "we've done enough poking around."

The following morning, notes were delivered to Harry, Cassie, Hermione, and Neville at the breakfast table. They were all the same:

Your detention will take place at eleven o'clock tonight.

Meet Mr. Filch in the entrance hall.

Professor McGonagall

At eleven o'clock that night, the three of them said good-bye to Ron in the common room and went down to the entrance hall with Neville. Filch was already there, and so was Malfoy. Cassie had also forgotten that Malfoy had gotten a detention, too.

"Follow me," said Filch, lighting a lamp and leading them outside.

"I bet you'll think twice about breaking a school rule again, won't you, eh?" he said, leering at them. "Oh yes... hard work and pain are the best teachers if you ask me... It's just a pity they let the old punishments die out... hang you by your wrists from the ceiling for a few days, I've got the chains still in my office, keep 'em well oiled in case they're ever needed... Right, off we go, and don't think of running off, now, it'll be worse for you if you do."

They marched off across the dark grounds. Neville kept sniffing. Cassie wondered what their punishment was going to be. It must be something really horrible, or Filch wouldn't be sounding so delighted.

The moon was bright, but clouds scudding across it kept throwing them into darkness. Ahead, Cassie could see the lighted windows of Hagrid's hut. Then they heard a distant shout.

"Is that you, Filch? Hurry up, I want ter get started."

"I suppose you think you'll be enjoying yourself with that oaf? Well, think again, boys and girls, it's into the forest you're going and I'm much mistaken if you'll all come out in one piece." said Filch

At this, Neville let out a little moan, and Malfoy stopped dead in his tracks.

"The forest?" he repeated, and he didn't sound quite as cool as usual. "We can't go in there at night, there's all sorts of things in there, werewolves, I heard."

"It's not even a full moon, you prat" snapped Cassie.

Hagrid came striding toward them out of the dark, Fang at his heel. He was carrying his large crossbow, and a quiver of arrows hung over his shoulder.

"Abou' time," he said. "I bin waitin' fer half an hour already. All right, Harry, Cassie, Hermione?"

"I shouldn't be too friendly to them, Hagrid," said Filch coldly, they're here to be punished, after all."

"That's why yer late, is it?" said Hagrid, frowning at Filch. "Bin lecturin' them, eh? 'Snot your place ter do that. Yeh've done yer bit, I'll take over from here."

"I'll be back at dawn," said Filch, "for what's left of them," he added nastily, and he turned and started back toward the castle, his lamp bobbing away in the darkness.

Malfoy now turned to Hagrid.

"I'm not going in that forest," he said, with a note of panic in his voice.

"Yeh are if yeh want ter stay at Hogwarts," said Hagrid fiercely. "Yeh've done wrong an' now yeh've got ter pay fer it."

"But this is servant stuff, it's not for students to do. I thought we'd be copying lines or something, if my father knew I was doing this, he'd-"

"Tell yer that's how it is at Hogwarts," Hagrid growled. "Copyin' lines! What good's that ter anyone? Yeh'll do summat useful or yeh'll get out. If yeh think yer father'd rather you were expelled, then get back off ter the castle an' pack. Go on."

Malfoy didn't move. He looked at Hagrid furiously, but then dropped his gaze.

"Right then," said Hagrid, "now, listen carefully, 'cause it's dangerous what we're gonna do tonight, an' I don' want no one takin' risks. Follow me over here a moment."

He led them to the very edge of the forest. Holding his lamp up high, he pointed down a narrow, winding earth track that disappeared into the thick black trees. A light breeze lifted their hair as they looked into the forest.

"Look there," said Hagrid, "see that stuff shinin' on the ground? Silvery stuff? That's unicorn blood. There's a unicorn in there bin hurt badly by summat. This is the second time in a week. I found one dead last Wednesday. We're gonna try an' find the poor thing. We might have ter put it out of its misery."

"And what if whatever hurt the unicorn finds us first?" said Malfoy, unable to keep the fear out of his voice.

"There's nothin' that lives in the forest that'll hurt yeh if yer with me or Fang," said Hagrid. "An' keep ter the path. Right, now, we're gonna split inter two parties an' follow the trail in diff'rent directions. There's blood all over the place, it must've bin staggerin' around since last night at least."

"I want Fang," said Malfoy quickly, looking at Fang's long teeth.

"All right, but I warn yeh, he's a coward," said Hagrid. "So me, Harry, Cassie an' Hermione'll go one way an' Draco, Neville, an' Fang'll go the other. Now, if any of us finds the unicorn, we'll send up green sparks, right? Get yer wands out an' practice now, that's it, an' if anyone gets in trouble, send up red sparks, an' we'll all come an' find yeh, so, be careful, let's go."

The forest was black and silent. A little way into it they reached a fork in the earth path, and Harry, Cassie, Hermione, and Hagrid took the left path while Malfoy, Neville, and Fang took the right.

They walked in silence, their eyes on the ground. Every now and then a ray of moonlight through the branches above lit a spot of silver-blue blood on the fallen leaves. They walked past a mossy tree stump. Cassie could hear running water; there must be a stream somewhere close by. There were still spots of unicorn blood here and there along the winding path.

"You all right, you three ?" Hagrid whispered. "Don' worry, it can't've gone far if it's this badly hurt, an' then we'll be able ter, GET BEHIND THAT TREE!"

Hagrid seized Harry, Cassie and Hermione and hoisted them off the path behind a towering oak. He pulled out an arrow and fitted it into his crossbow, raising it, ready to fire. The three of them listened. Something was slithering over dead leaves nearby: it sounded like a cloak trailing along the ground. Hagrid was squinting up the dark path, but after a few seconds, the sound faded away.

"I knew it," he murmured. "There's summat in here that shouldn' be."

They walked more slowly, ears straining for the faintest sound. Suddenly, in a clearing ahead, something definitely moved.

"Who's there?" Hagrid called. "Show yerself , I'm armed!"

And into the clearing came, was it a man, or a horse? To the waist, a man, with red hair and beard, but below that was a horse's gleaming chestnut body with a long, reddish tail. Harry, Cassie and Hermione's jaws dropped.

"Oh, it's you, Ronan," said Hagrid in relief. "How are yeh?"

He walked forward and shook the centaur's hand.

"Good evening to you, Hagrid," said Ronan. He had a deep, sorrowful voice. "Were you going to shoot me?"

"Can't be too careful, Ronan," said Hagrid, patting his crossbow. "There's summat bad loose in this forest. This is Harry Potter, Cassie Black an' Hermione Granger, by the way. Students up at the school. An' this is Ronan, you three. He's a centaur.

"We'd noticed," said Hermione faintly.

"Good evening," said Ronan. "Students, are you? And do you learn much, up at the school?"

"Erm.." said Cassie

"A bit," said Hermione timidly.

"A bit. Well, that's something." Ronan sighed. He flung back his head and stared at the sky. "Mars is bright tonight."

"Yeah," said Hagrid, glancing up, too. "Listen, I'm glad we've run inter yeh, Ronan, 'cause there's a unicorn bin hurt, you seen anythin'?"

Ronan didn't answer immediately. He stared unblinkingly upward, then sighed again.

"Always the innocent are the first victims," he said. "So it has been for ages past, so it is now."

"Yeah," said Hagrid, "but have yeh seen anythin' Ronan? Anythin' unusual?"

"Mars is bright tonight," Ronan repeated, while Hagrid watched him impatiently. "Unusually bright."

"Yeah, but I was meanin' anythin' unusual a bit nearer home, said Hagrid. "So yeh haven't noticed anythin' strange?"

Yet again, Ronan took a while to answer. At last, he said, "The forest hides many secrets."

A movement in the trees behind Ronan made Hagrid raise his bow again, but it was only a second centaur, black-haired and -bodied and wilder-looking than Ronan.

"Hullo, Bane," said Hagrid. "All right?"

"Good evening, Hagrid, I hope you are well?"

"Well enough. Look, I've jus' bin askin' Ronan, you seen anythin' odd in here lately? There's a unicorn bin injured, would yeh know anythin' about it?"

Bane walked over to stand next to Ronan. He looked skyward. "Mars is bright tonight," he said simply.

"We've heard," said Hagrid grumpily. "Well, if either of you do see anythin', let me know, won't yeh? We'll be off, then."

Harry, Cassie and Hermione followed him out of the clearing, staring over their shoulders at Ronan and Bane until the trees blocked their view.

"Never," said Hagrid irritably, "try an' get a straight answer out of a centaur. Ruddy stargazers. Not interested in anythin' closer'n the moon."

"Are there many of them in here?" asked Cassie.

"Oh, a fair few... Keep themselves to themselves mostly, but they're good enough about turnin' up if ever I want a word. They're deep, mind, centaurs... they know things... jus' don' let on much."

"D'you think that was a centaur we heard earlier?" said Harry.

"Did that sound like hooves to you? Nah, if yeh ask me, that was what's bin killin' the unicorns, never heard anythin' like it before."

They walked on through the dense, dark trees. They had just passed a bend in the path when Hermione grabbed Hagrid's arm.

"Hagrid! Look! Red sparks, the others are in trouble!"

"You three wait here!" Hagrid shouted. "Stay on the path, I'll come back for yeh!"

They heard him crashing away through the undergrowth and stood looking at each other, very scared, until they couldn't hear anything but the rustling of leaves around them.

"You don't think they've been hurt, do you?" whispered Hermione.

"I don't care if Malfoy has, but if something's got Neville... it's our fault he's here in the first place." Harry whispered back

At last, a great crunching noise announced Hagrid's return. Malfoy, Neville, and Fang were with him. Hagrid was fuming. Malfoy, it seemed, had sneaked up behind Neville and grabbed him as a joke. Neville had panicked and sent up the sparks.

"We'll be lucky ter catch anythin' now, with the racket you two were makin'. Right, we're changin' groups, Neville, you stay with me an' Hermione, Harry, Cassie, you go with Fang an' this idiot. I'm sorry," Hagrid added in a whisper to Harry and Cassie, "but he'll have a harder time frightenin' you two, an' we've gotta get this done."

So Cassie set off into the heart of the forest with Harry, Malfoy and Fang. They walked for nearly half an hour, deeper and deeper into the forest, until the path became almost impossible to follow because the trees were so thick. Cassie thought the pools of blood seemed to be getting larger. There were splashes on the roots of a tree, as though the poor creature had been thrashing around in pain close by. Cassie could see a clearing ahead, through the tangled branches of an ancient oak.

"Look.." Harry murmured, holding out his arms to stop Cassie and Malfoy.

Something bright white was gleaming on the ground. They inched closer.

It was the unicorn all right, and it was dead. Cassie had never seen anything so beautiful yet sad. Its long, slender legs were stuck out at odd angles where it had fallen and its mane was spread pearly-white on the dark leaves.

A bush on the edge of the clearing quivered... Then, out of the shadows, a hooded figure came crawling across the ground like some stalking beast. Harry, Cassie, Malfoy, and Fang stood transfixed. The cloaked figure reached the unicorn, lowered its head over the wound in the animal's side, and began to drink its blood.

"AAAAAAAAAARGH!"

Malfoy let out a terrible scream and grabbed Cassie's arm and bolted out of the clearing.

"What about Harry?" shouted Cassie, trying to pull Malfoy off her.

Malfoy shook his head and refused to let go of her arm. He kept on running and tugging her along until they reached the edge of the forest. Hermione and Neville stood there looking nervous, Malfoy dropped her arm but kept running towards the castle and soon his disappeared out of sight.

"Cassie !" said Hermione looking worried, "Where's Harry ?"

"I don't know, " replied Cassie, peering into the forest. "We found the unicorn and something was drinking it's blood. Malfoy grabbed me and ran so I couldn't go back for Harry."

"It's alright." said Hermione soothingly, rubbing Cassie's shoulder.

"No its not !" snapped Cassie, shrugging her off "I should've stayed with Harry."

Just then Hagrid came out of the forest with Harry who looked pale and scared. Cassie and Hermione hurried forward and hugged him.

Ron had fallen asleep in the dark common room, waiting for them to return. He shouted something about Quidditch fouls when Harry roughly shook him awake. In a matter of seconds, though, he was wide-eyed as Harry began to tell him what had happened in the forest.

Harry couldn't sit down. He paced up and down in front of the fire. He was still shaking.

"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..."

"Stop saying the name!" said Ron in a terrified whisper, as if he thought Voldemort could hear them.

Harry wasn't listening.

"Firenze saved me, but he shouldn't have done so... Bane was furious... he was talking about interfering with what the planets say is going to happen... They must show that Voldemort's coming back... Bane thinks Firenze should have let Voldemort kill me... I suppose that's written in the stars as well."

"Will you stop saying the name!" Ron hissed.

"So all I've got to wait for now is Snape to steal the Stone," Harry went on feverishly, "then Voldemort will be able to come and finish me off... Well, I suppose Bane'll be happy."

Hermione looked very frightened, but she had a word of comfort.

"Harry, everyone says Dumbledore's the only one You-Know-Who was ever afraid of with Dumbledore around, You-Know-Who won't touch you. Anyway, who says the centaurs are right? It sounds like fortune-telling to me, and Professor McGonagall says that's a very imprecise branch of magic."

"Well if Professor McGonagall said.." muttered Cassie, who was so pale she might of been see-through.

The sky had turned light before they stopped talking and they went to bed exhausted, their throats sore.