They slipped back down the spiral staircase, their hearts as light as
their hands, now that Norbert was off them. No more dragon -- Malfoy in
detention -- what could spoil their happiness?The answer to that was waiting at the foot of the stairs. As they stepped into the corridor, Filch's face loomed suddenly out of the darkness.
"Well, well, well," he whispered, "we are in trouble."
They'd left the invisibility cloak on top of the tower.
