“The important thing is, I was watching it carefully this evening, because I had an idea that you, Ron, and Hermione might try and sneak out of the castle to visit Hagrid before his hippogriff was executed. And I was right, wasn’t I?”

He had started to pace up and down, looking at them. Little patches of dust rose at his feet.

“You might have been wearing your father’s old cloak, Harry—”

“How d’you know about the cloak?”

“The number of times I saw James disappearing under it . . . ,” said Lupin, waving an impatient hand again. “The point is, even if you’re wearing an Invisibility Cloak, you still show up on the Marauder’s Map. I watched you cross the grounds and enter Hagrid’s hut. Twenty minutes later, you left Hagrid, and set off back toward the castle. But you were now accompanied by somebody else.”

“What?” said Harry. “No, we weren’t!”

“I couldn’t believe my eyes,” said Lupin, still pacing, and ignoring Harry’s interruption. “I thought the map must be malfunctioning. How could he be with you?”

“No one was with us!” said Harry.

“And then I saw another dot, moving fast toward you, labeled Sirius Black . . . I saw him collide with you; I watched as he pulled two of you into the Whomping Willow—”

“One of us!” Ron said angrily.

“No, Ron,” said Lupin. “Two of you.”

He had stopped his pacing, his eyes moving over Ron.

“Do you think I could have a look at the rat?” he said evenly.

“What?” said Ron. “What’s Scabbers got to do with it?”

“Everything,” said Lupin. “Could I see him, please?”

Ron hesitated, then put a hand inside his robes. Scabbers emerged, thrashing desperately; Ron had to seize his long bald tail to stop him escaping. Crookshanks stood up on Black’s leg and made a soft hissing noise.

Lupin moved closer to Ron. He seemed to be holding his breath as he gazed intently at Scabbers.

“What?” Ron said again, holding Scabbers close to him, looking scared. “What’s my rat got to do with anything?”

“That’s not a rat,” croaked Sirius Black suddenly.

“What d’you mean—of course he’s a rat—”

“No, he’s not,” said Lupin quietly. “He’s a wizard.”

“An Animagus,” said Black, “by the name of Peter Pettigrew.”

Chapter 18

CHAPTER 18

Mooney, Wormtail, Padfoot, and Prongs

It took a few seconds for the absurdity of this statement to sink in. Then Ron voiced what Harry was thinking.

“You’re both mental.”

“Ridiculous!” said Hermione faintly.

“Peter Pettigrew’s dead!” said Harry. “He killed him twelve years ago!” He pointed at Black, whose face twitched convulsively.

“I meant to,” he growled, his yellow teeth bared, “but little Peter got the better of me . . . not this time, though!”

And Crookshanks was thrown to the floor as Black lunged at Scabbers; Ron yelled with pain as Black’s weight fell on his broken leg.