He sat up in bed and saw that the room was full of moonlight. Doctor Cornelius， muffled in a hooded robe and holding a small lamp in his hand， stood by the bedside. Caspian remembered at once what they were going to do. He got up and put on some clothes. Athough it was a summer night he felt colder than he had expected and was quite glad when the Doctor wrapped him in a robe like his own and gave him a pair of warm， soft buskins for his feet. A moment later， both muffled so that they could hardly be seen in the dark corridors， and both shod so that they made almost no noise， master and pupil left the room.
Caspian followed the Doctor through many passages and up several staircases， and at last， through a little door in a turret， they came out upon the leads. On one side were the battlements， on the other a steep roof； below them， all shadowy and shimmery， the castle gardens； above them， stars and moon. Presently they came to another door which led into the great central tower of the whole castle： Doctor Cornelius unlocked it and they began to climb the dark winding stair of the tower. Caspian was becoming excited； he had never been allowed up this stair before.