After dinner, Su Er avoided the young wizards heading back to their dormitories in twos and threes and slipped alone up to the Castle's Seventh Floor.
It was time to reveal the prize.
The whole day had given Black more than enough time to leave through the Castle's secret passages.
"I need a room for brewing potions." Su Er walked back and forth across the open space before the tapestry three times, and an old-fashioned door appeared.
Just as I thought... A faint smile touched Su Er's lips. His judgment had been right. After raiding Gryffindor Tower last night, Black had hidden here.
The Remembrall was working very well. The images constantly shifting and turning at its center showed that it had faithfully recorded the day's events.
Su Er sat in the room the Room of Requirement had prepared for him, brought his eyes close to the Remembrall, and began watching.
Apart from a few bold couples sneaking into the corridor near the Headmaster's Office to snog, the place had been quiet throughout the morning.
A change came at noon, when all the young wizards were busy tucking into their food in the Great Hall.
A door appeared in what should have been a blank wall, and a black dog with matted fur, so thin that its skin clung to its bones, walked out.
Others might not know, but Su Er knew perfectly well that this black dog was actually Black's Animagus form.
After watching this, Su Er put the Remembrall into the little cloth pouch he kept close to his body, rested his arm on the table, and unconsciously tapped his fingers against its surface.
Su Er was not surprised that Black knew such a room existed in the Castle. What he was considering was that, with this solid