Rereading Harry Potter and the Prisoner of Azkaban. One chapter a day. Chapter Nine - Grim Defeat.
"Did she say who did it?" said Dumbledore quietly.
"Oh, yes, Professorhead," said Peeves, with the air of one cradling a large bombshell in his arms. "He got very angry when she wouldn’t let him in, you see." Peeves flipped over, and grinned at Dumbledore from between his own legs. "Nasty temper he’s got, that Sirius Black."
Rereading Harry Potter and the Prisoner of Azkaban. One chapter a day. Chapter Eight - Flight of the Fat Lady.