“He wasn’t the only one,” said Sirius bitterly. “Most go mad in there, and plenty stop eating in the end. They lose the will to live. You could always tell when a death was coming, because the dementors could sense it, they got excited. That boy looked pretty sickly when he arrived. Crouch being an important Ministry member, he and his wife were allowed a deathbed visit. That was the last time I saw Barty Crouch, half carrying his wife past my cell. She died herself, apparently, shortly afterward. Grief. Wasted away just like the boy. Crouch never came for his son’s body. The dementors buried him outside the fortress; I watched them do it.”

Sirius threw aside the bread he had just lifted to his mouth and instead picked up the flask of pumpkin juice and drained it.

“So old Crouch lost it all, just when he thought he had it made,” he continued, wiping his mouth with the back of his hand. “One moment, a hero, poised to become Minister of Magic . . . next, his son dead, his wife dead, the family name dishonored, and, so I’ve heard since I escaped, a big drop in popularity. Once the boy had died, people started feeling a bit more sympathetic toward the son and started asking how a nice young lad from a good family had gone so badly astray. The conclusion was that his father never cared much for him. So Cornelius Fudge got the top job, and Crouch was shunted sideways into the Department of International Magical Cooperation.”

There was a long silence. Harry was thinking of the way Crouch’s eyes had bulged as he’d looked down at his disobedient house-elf back in the wood at the Quidditch World Cup. This, then, must have been why Crouch had overreacted to Winky being found beneath the Dark Mark. It had brought back memories of his son, and the old scandal, and his fall from grace at the Ministry.

“Moody says Crouch is obsessed with catching Dark wizards,” Harry told Sirius.

“Yeah, I’ve heard it’s become a bit of a mania with him,” said Sirius, nodding. “If you ask me, he still thinks he can bring back the old popularity by catching one more Death Eater.”

“And he sneaked up here to search Snape’s office!” said Ron triumphantly, looking at Hermione.

“Yes, and that doesn’t make sense at all,” said Sirius.

“Yeah, it does!” said Ron excitedly, but Sirius shook his head.

“Listen, if Crouch wants to investigate Snape, why hasn’t he been coming to judge the tournament? It would be an ideal excuse to make regular visits to Hogwarts and keep an eye on him.”

“So you think Snape could be up to something, then?” asked Harry, but Hermione broke in.

“Look, I don’t care what you say, Dumbledore trusts Snape—”