"I found this at the base of the Whomping Willow," said Snape, throwing the cloak aside, careful to keep this wand pointing directly at Lupin's chest. "Very useful, I thank you…"

Snape was slightly breathless, but his face was full of suppressed triumph. "You're wondering, perhaps, how I knew you were here?" he said, his eyes glittering. "I've just been to your office, Lupin. You forgot to take your potion tonight, so I took a goblet-full along. And very lucky I did... lucky for me, I mean. Lying on your desk was a certain map. One glance at it told me all I needed to know. I saw you running along this passageway and out of sight."

"Severus —" Lupin began, but Snape overrode him.

"I've told the headmaster again and again that you're helping your old friend Black into the castle, Lupin, and here's the proof. Not even I dreamed you would have the nerve to use this old place as your hideout —"

"Severus, you're making a mistake," said Lupin urgently. "You haven't heard everything — I can explain — Sirius is not here to kill Arabella nor Lyla—"

"Two more for Azkaban tonight," said Snape, his eyes now gleaming fanatically. "I shall be interested to see how Dumbledore takes this... He was quite convinced you were harmless, you know, Lupin... a tame werewolf —"

"You fool," said Lupin softly. "Is a schoolboy grudge worth putting an innocent man back inside Azkaban?"

BANG!

Thin, snakelike cords burst from the end of Snape's wand and twisted themselves around Lupin's mouth, wrists, and ankles; he overbalanced and fell to the floor, unable to move. With a roar of rage, Black started toward Snape, but Snape pointed his wand straight between Black's eyes.

"Give me a reason," he whispered. "Give me a reason to do it, and I swear I will."

Black stopped dead. It would have been impossible to say which face showed more hatred.

Arabella stood there, paralyzed, not knowing what to do or whom to believe. She glanced around her friends, Lyla watching the scene unfold before them. Ron looked just as confused as he did, still fighting to keep a hold on the struggling Scabbers. Draco, however, took an uncertain step toward Snape and said, in a very breathless voice, "Professor Snape— it wouldn't hurt to hear what they've got to say, would it?"

"Mr. Malfoy, your father will be most disappointed when he hears of your collusion with all this," Snape said cooly. "I advise you to keep your mouth shut from further incriminating yourself."

Draco went even paler, his pupil's pinpricks of fear.

"But if — if there was a mistake —"

"KEEP QUIET!" Snape shouted, looking suddenly quite deranged. "DON'T TALK ABOUT WHAT YOU DON'T UNDERSTAND!"

A few sparks shot out of the end of his wand, which was still pointed at Black's face. Draco fell silent.

"Vengeance is very sweet," Snape breathed at Black. "How I hoped I would be the one to catch you..."

"The joke's on you again, Severus," Black snarled. "As long as this boy brings his rat up to the castle" — he jerked his head at Ron — "I'll come quietly..."

"Up to the castle?" said Snape silkily. "I don't think we need to go that far. All I have to do is call the Dementors once we get out of the Willow. They'll be very pleased to see you, Black... pleased enough to give you a little kiss, I daresay... I —"

What little color there was in Black's face left it.

"You — you've got to hear me out," he croaked. "The rat — look at the rat —"

But there was a mad glint in Snape's eyes. He seemed beyond reason.

"Come on, all of you," he said. He clicked his fingers, and the ends of the cords that bound Lupin flew to his hands. "I'll drag the werewolf. Perhaps the Dementors will have a kiss for him, too — "

Before she knew what she was doing, Arabella had crossed the room in three strides and blocked the door.

"Get out of the way, girl, you're in enough trouble already," snarled Snape. "If I hadn't been here to save your skin —"

"Professor Lupin could have killed me about a hundred times this year," Arabella said. "I've been alone with him loads of times, having defense lessons against the Dementors. If he was helping Black, why didn't he just finish me off then?"

"Don't ask me to fathom the way a werewolf's mind works," hissed Snape. "Get out of the way, Potter."

"YOU'RE PATHETIC!" she yelled. "JUST BECAUSE THEY MADE A FOOL OF YOU AT SCHOOL YOU WON'T EVEN LISTEN —"

"SILENCE! I WILL NOT BE SPOKEN TO LIKE THAT!" Snape bellowed, looking madder than ever. "Like father, like daughter, in more aspects than just one! I have just saved your neck; you should be thanking me on bended knee! You would have been well served if he'd killed you! You'd have died like your father, too arrogant to believe you might be mistaken in Black — now get out of the way, or I will make you. GET OUT OF THE WAY!"

Arabella made up her mind in a split second. Before Snape could take even one step toward him, she had raised his wand.

"Expelliarmus!" she yelled — except that hers wasn't the only voice that shouted. There was a blast that made the door rattle on its hinges; Snape was lifted off his feet and slammed into the wall, then slid down it to the floor, a trickle of blood oozing from under his hair. He had been knocked out.

Arabella looked around wildly. Both Draco and Lyla had tried to disarm Snape at exactly the same moment. Snape's wand soared in a high arc and landed on the bed next to Crookshanks.

"You shouldn't have done that," said Black, looking at them all. "You should have left him to me..."

Arabella avoided Black's eyes. She wasn't sure, even now, that she'd done the right thing.

Lupin was struggling against his bonds. Black bent down quickly and untied him. Lupin straightened up, rubbing his arms where the ropes had cut into them.

"Thank you," he said.

"I'm still not saying I believe you," she told Lupin.

"Then it's time we offered you some proof," said Lupin. "Ron — give me Peter, please. Now."

Ron clutched Scabbers closer to his chest.

"Come off it," he said weakly. "Are you trying to say he broke out of Azkaban just to get his hands on Scabbers? I mean..." He looked up at Arabella and Lyla for support, "Okay, say Pettigrew could turn into a rat — there are millions of rats — how's he supposed to know which one he is after if he was locked up in Azkaban?"

"You know, Sirius, that's a fair question," said Lupin, turning to Black and frowning slightly. "How did you find out where he was?"

Black put one of his claw-like hands inside his robes and took out a crumpled piece of paper, which he smoothed flat and held out to show the others.

It was a photograph of Ron and his family from the Daily Prophet, and there, on Ron's shoulder, was Scabbers.

"How did you get this?" Lupin asked Black, thunderstruck.

"Fudge," said Black. "When he came to inspect Azkaban last year, he gave me his paper. And there was Peter, on the front page on this boy's shoulder... I knew him at once... how many times had I seen him transform? And the caption said the boy would be going back to Hogwarts... to where the girls were..."

"My God," said Lupin softly, staring from Scabbers to the picture in the paper and back again. "His front paw..."

"What about it?" said Ron defiantly.

"He's got a toe missing," said Black.

"Of course," Lupin breathed. "So simple... so brilliant... he cut it off himself?"

"Just before he transformed," said Black. "When I cornered him, he yelled for the whole street to hear that I'd betrayed Lily and James. Then, before I could curse him, he blew apart the street with the wand behind his back, killed everyone within twenty feet of himself — and sped down into the sewer with the other rats..."

"Didn't you ever hear, Ron?" said Lupin. "The biggest bit of Peter they found was his finger."

"Look, Scabbers probably had a fight with another rat or something! He's been in my family for ages, right —"

"Twelve years, in fact," said Lupin. "Didn't you ever wonder why he was living so long?"

"We — we've been taking good care of him!" said Ron.

"Not looking too good at the moment, though, is he?" said Lupin. "I'd guess he's been losing weight ever since he heard Sirius was on the loose again..."

"He's been scared of that mad cat!" said Ron, nodding toward Crookshanks, who was still purring on the bed.

But that wasn't right… Scabbers had been looking ill before he met Crookshanks... ever since Ron's return from Egypt... since the time when Black had escaped...

"This cat isn't mad," said Black hoarsely. He reached out a bony hand and stroked Crookshanks's fluffy head. "He's the most intelligent of his kind I've ever met. He recognized Peter for what he was right away. And when he met me, he knew I was no dog. It was a while before he trusted me... Finally, I managed to communicate to him what I was after, and he's been helping me..."

"What do you mean?" breathed Lyla.

"He tried to bring Peter to me, but couldn't... so he stole the passwords into Gryffindor Tower for me... As I understand it, he took them from a boy's bedside table..."

Arabella's brain seemed to be sagging under the weight of what she was hearing. It was absurd... and yet…

"But Peter got wind of what was going on and ran for it." croaked Black. "This cat — Crookshanks, did you call him? — told me Peter had left blood on the sheets... I supposed he bit himself... Well, faking his own death had worked once."

These words jolted Arabella to her senses.

"And why did he fake his death?" he said furiously. "Because he knew you were about to kill him like you killed my parents!"

"No," said Lupin, "Listen—"

"And now you've come to finish him off!"

"Yes, I have," said Black, with an evil look at Scabbers.

"Then I should've let Snape take you!" she shouted.

"Arabella," said Lupin hurriedly, "don't you see? All this time we've thought Sirius betrayed your parents, and Peter tracked him down — but it was the other way around, don't you see? Peter betrayed your mother and father — Sirius tracked Peter down —"

"THAT'S NOT TRUE!" Arabella yelled. "HE WAS THEIR SECRET-KEEPER! HE SAID SO BEFORE YOU TURNED UP. HE SAID HE KILLED THEM!"

She was pointing at Black, who shook his head slowly; the sunken eyes were suddenly over bright.

"You're right... I as good as killed them," he croaked. "I persuaded Lily and James to change to Peter at the last moment, persuaded them to use him as Secret-Keeper instead of me... I'm to blame, I know it... The night they died, I'd arranged to check on Peter, make sure he was still safe, but when I arrived at his hiding place, he'd gone. Yet there was no sign of a struggle. It didn't feel right. I was scared. I set out for your parents' house straight away. And when I saw their house, destroyed, and their bodies... I realized what Peter must've done... what I'd done..."

His voice broke. He turned away.

"Enough of this," said Lupin, and there was a steely note in his voice Arabella had never heard before. "There's one certain way to prove what really happened. Ron, give me that rat."

"What are you going to do with him if I give him to you?" Ron asked Lupin tensely.

"Force him to show himself," said Lupin. "If he really is a rat, it won't hurt him."

Ron hesitated. Then at long last, he held out Scabbers and Lupin took him. Scabbers began to squeak without stopping, twisting and turning, his tiny black eyes bulging in his head. "Ready, Sirius?" said Lupin.

Black had already retrieved Snape's wand from the bed. He approached Lupin and the struggling rat, and his wet eyes suddenly seemed to be burning in his face.

"Together?" he said quietly.

"I think so", said Lupin, holding Scabbers tightly in one hand and his wand in the other. "On the count of three. One — two — THREE!"

A flash of blue-white light erupted from both wands; for a moment, Scabbers was frozen in midair, his small gray form twisting madly — Ron yelled — the rat fell and hit the floor. There was another blinding flash of light and then — It was like watching a speeded-up film of a growing tree. A head was shooting upward from the ground; limbs were sprouting; a moment later, a man was standing where Scabbers had been, cringing and wringing his hands. Crookshanks was spitting and snarling on the bed; the hair on his back was standing up.

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