The Tower must have a special meaning for him if he was willing to brave the cold, the Prefects, and the professors to go there. Wanting to find out what that meaning was, Hermione continued to spy on him for the next few evenings, trying to get a precise picture of the timing and method of his movements. She soon noticed that Malfoy was tempting fate almost every night between ten and midnight, during that interval when the patrols ended and Filch patrolled the corridors of the opposite wing.