“Of course, if it was me,” he said quietly, “I’d have done something before now. I wouldn’t be staying in school like a good boy, I’d be out there looking for him.”

“What are you talking about, Malfoy?” said Ron roughly.

“Don’t you know, Potter?” breathed Malfoy, his pale eyes narrowed.

“Know what?”

Malfoy let out a low, sneering laugh.

“Maybe you’d rather not risk your neck,” he said. “Want to leave it to the dementors, do you? But if it was me, I’d want revenge. I’d hunt him down myself.”

“What are you talking about?” said Harry angrily, but at that moment Snape called, “You should have finished adding your ingredients by now; this potion needs to stew before it can be drunk, so clear away while it simmers and then we’ll test Longbottom’s . . . ”

Crabbe and Goyle laughed openly, watching Neville sweat as he stirred his potion feverishly. Hermione was muttering instructions to him out of the corner of her mouth, so that Snape wouldn’t see. Harry and Ron packed away their unused ingredients and went to wash their hands and ladles in the stone basin in the corner.

“What did Malfoy mean?” Harry muttered to Ron as he stuck his hands under the icy jet that poured from the gargoyle’s mouth. “Why would I want revenge on Black? He hasn’t done anything to me—yet.”

“He’s making it up,” said Ron savagely. “He’s trying to make you do something stupid . . . ”

The end of the lesson in sight, Snape strode over to Neville, who was cowering by his cauldron.

“Everyone gather ’round,” said Snape, his black eyes glittering, “and watch what happens to Longbottom’s toad. If he has managed to produce a Shrinking Solution, it will shrink to a tadpole. If, as I don’t doubt, he has done it wrong, his toad is likely to be poisoned.”

The Gryffindors watched fearfully. The Slytherins looked excited. Snape picked up Trevor the toad in his left hand and dipped a small spoon into Neville’s potion, which was now green. He trickled a few drops down Trevor’s throat.

There was a moment of hushed silence, in which Trevor gulped; then there was a small pop, and Trevor the tadpole was wriggling in Snape’s palm.

The Gryffindors burst into applause. Snape, looking sour, pulled a small bottle from the pocket of his robe, poured a few drops on top of Trevor, and he reappeared suddenly, fully grown.

“Five points from Gryffindor,” said Snape, which wiped the smiles from every face. “I told you not to help him, Miss Granger. Class dismissed.”

Harry, Ron, and Hermione climbed the steps to the entrance hall. Harry was still thinking about what Malfoy had said, while Ron was seething about Snape.

“Five points from Gryffindor because the potion was all right! Why didn’t you lie, Hermione? You should’ve said Neville did it all by himself!”