Nobody challenges Draco when he walks into the entrance hall of the castle, and that makes him uneasy. Surely there should be wards up against intruders. Maybe the castle lets him in because it recognizes him as a student, or maybe – and he hopes this isn’t the case – because of his Dark Mark. He doesn’t linger by the entrance and makes his way past occasional wandering students and up the various staircases to the seventh floor. He stands near where he knows the entrance to the Room of Hidden Things must be, and concentrates on finding the Lost Diadem of Ravenclaw. Within seconds, the door becomes visible, and he enters the room, closing the door behind him with a sigh of relief. Now to find the diadem in the welter of old furniture, moldering books, broken candelabra, and the occasional quidditch helmet piled in unstable heaps. It wasn’t hidden, he remembers. I saw it, but it was full of dark magic so I didn’t touch it.