These two galleries cross each other at right angles.

Who had left that window open?
Or, who had come to open it?
I went to the window and leaned out.

Five feet below me there was a sort of terrace over the semi-circular projection of a room on the ground-floor.

One could, if one wanted, jump from the window on to the terrace, and allow oneself to drop from it into the court of the chateau.

Whoever had entered by this road had, evidently, not had a key to the vestibule door.