“My dear Holmes!” I ejaculated.

“Oh, there could be no question as to the superimposing of the footmarks. I had the advantage of learning which was which last night. They ascended, then, to Mr. Blessington’s room, the door of which they found to be locked. With the help of a wire, however, they forced round the key. Even without the lens you will perceive, by the scratches on this ward, where the pressure was applied.

“On entering the room their first proceeding must have been to gag Mr. Blessington. He may have been asleep, or he may have been so paralyzed with terror as to have been unable to cry out. These walls are thick, and it is conceivable that his shriek, if he had time to utter one, was unheard.