The school talked of nothing but Sirius Black for the next few days. The theories about how he had entered the castle became wilder and wilder; Hannah Abbott, from Hufflepuff, spent much of their next Herbology class telling anyone who'd listen that Black could turn into a flowering shrub.

The Fat Lady's ripped canvas had been taken off the wall and Replaced with the portrait of Sir Cadogan and his fat gray pony. Nobody was very happy about this. Sir Cadogan spent half his time challenging people to duels, and the rest thinking up ridiculously complicated passwords, which he changed at least twice a day.

"He's a complete lunatic," said Seamus Finnigan angrily to Percy. "Can'twe get anyone else?"

"None of the other pictures wanted the job," said Percy. "Frightened of what happened to the Fat Lady. Sir Cadogan was the only one brave enough to volunteer."

Sir Cadogan, however, was the least of Harry's worries. He was now being closely watched. Teachers found excuses to walk along corridors with him, and Percy Weasley (acting, Harry suspected, on his mother's orders) was tailing him everywhere like an extremely pompous guard dog. Amelia was even following him everywhere, though she took it more slightly than the others and would leave him be for a while if he asked. To cap it all, Professor McGonagall summoned Harry into her office, with such a somber expression on her face Harry thought someone must have died.

"There's no point hiding it from you any longer, Potter," she said in a very serious voice. "I know this will come as a shock to you, but Sirius Black --"

"I know he's after me," said Harry wearily. "I heard Ron's dad telling his mum. Mr. Weasley works for the Ministry of Magic."

Professor McGonagall seemed very taken aback. She stared at Harry for a moment or two, then said, "I see! Well, in that case, Potter, you'll understand why I don't think it's a good idea for you to be practicing