"That's your best story?" he sneered. "Now, you don't expect me to believe that, do you?"

"Severus-"

"No, I think that isn't enough."

"We have-"

Professor Snape pointed his wand at Lupin, and opened it, but before he could,

"Expelliarmus!" Harry, Ron, and Hermione yelled in unison.

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.

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 Harry. "You should have left him to me..."

Harry avoided Black's eyes. It was obvious he wasn't confident in his decision.

"We attacked a teacher... We attacked a teacher..." Hermione whimpered, staring at the lifeless Snape with frightened eyes. "Oh, we're going to be in so much trouble —"

Lupin rubbed his arm and shot a weak smile at Sirius before turning to Harry.

"Thank you, Harry," he said.

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

"Then it's time we offered you some proof," said Lupin. "You, boy — 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 Harry, Delilah, and Hermione 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 the photograph of Ron and his family that had appeared in the Daily Prophet the previous summer, 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 Harry was..."

"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 —"

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