The screaming inside Harry’s head had started again—except this time, it sounded as though it were coming from a badly tuned radio—softer and louder and softer again—and he could still see the dementor—it had halted—and then a huge, silver shadow came bursting out of the end of Harry’s wand, to hover between him and the dementor, and though Harry’s legs felt like water, he was still on his feet—though for how much longer, he wasn’t sure—

“Riddikulus!” roared Lupin, springing forward.

There was a loud crack, and Harry’s cloudy Patronus vanished along with the dementor; he sank into a chair, feeling as exhausted as if he’d just run a mile, and felt his legs shaking. Out of the corner of his eye, he saw Professor Lupin forcing the boggart back into the packing case with his wand; it had turned into a silvery orb again.

“Excellent!” Lupin said, striding over to where Harry sat. “Excellent, Harry! That was definitely a start!”

“Can we have another go? Just one more go?”

“Not now,” said Lupin firmly. “You’ve had enough for one night. Here—”

He handed Harry a large bar of Honeydukes’ best chocolate.

“Eat the lot, or Madam Pomfrey will be after my blood. Same time next week?”

“Okay,” said Harry. He took a bite of the chocolate and watched Lupin extinguishing the lamps that had rekindled with the disappearance of the dementor. A thought had just occurred to him.

“Professor Lupin?” he said. “If you knew my dad, you must’ve known Sirius Black as well.”

Lupin turned very quickly.

“What gives you that idea?” he said sharply.

“Nothing—I mean, I just knew they were friends at Hogwarts too . . . ”

Lupin’s face relaxed.

“Yes, I knew him,” he said shortly. “Or I thought I did. You’d better be off, Harry, it’s getting late.”

Harry left the classroom, walking along the corridor and around a corner, then took a detour behind a suit of armor and sank down on its plinth to finish his chocolate, wishing he hadn’t mentioned Black, as Lupin was obviously not keen on the subject. Then Harry’s thoughts wandered back to his mother and father . . .

He felt drained and strangely empty, even though he was so full of chocolate. Terrible though it was to hear his parents’ last moments replayed inside his head, these were the only times Harry had heard their voices since he was a very small child. But he’d never be able to produce a proper Patronus if he half wanted to hear his parents again . . .

“They’re dead,” he told himself sternly. “They’re dead and listening to echoes of them won’t bring them back. You’d better get a grip on yourself if you want that Quidditch Cup.”

He stood up, crammed the last bit of chocolate into his mouth, and headed back to Gryffindor Tower.

• • •