THE CASE OF THE DIXON TORPEDO
"In the outer office my men usually work. In the inner office I work myself. These rooms communicate, as you see, by a door. Our ordinary way in and out of the place is by the door of the outer office leading into the corridor, and we first pass through the usual lifting flap in the barrier. The door leading from the inner office to the corridor is always kept locked on the inside, and I don't suppose I unlock it once in three months. It has not been unlocked all the morning. The drawer in which the missing drawings were kept, and in which I saw them at ten o'clock this morning, is at the place marked D; it is a large chest of shallow drawers in which the plans lie flat."
"I quite understand. Then there is the private room opposite. What of that?"
