hearing the key in the outer door (and such a thing could be heard all over the rooms, as I tested for myself)—his impulse, I say, would be to retreat by the way he had come, that is by the window. If, then, Mr. Deacon had overtaken him before he could escape, the murder might have taken place just as it had done, but it would have been in the bedroom, not in a room in the opposite direction. And any thief's attention would naturally be directed at first to the gold plate—indeed, I detected a fresh knife-mark in the door of the case, which I will show you presently. Now, as you see by the arrangement of the rooms, the retreat from the plate case to the bedroom window would be a short one, whereas the murderer must in fact have taken a longer journey in the opposite direction. Why? Because he had arrived from that direction, and his natural impulse was to retreat by the way he had come. This might have been by the door to the back stairs, but a careful examination of this door and its lock and key convinced me that it had not been opened. The key was dirty, and to have turned it from the opposite side would have necessitated the forcible use of a pair of thin hollow pliers (a familiar tool to burglars), and
