had come in or gone out. It would establish his only possible alibi—a negative one, to be sure; but, with a good lawyer, he could probably make it hold. Doubtless he searched for other means of escape, but found himself confronted with obstacles on every hand. The side door was his only hope. How could it be worked?"
Vance rose and yawned.
"That's my caressin' theory. Skeel was caught in a trap, and with his shrewd, tricky brain he figured his way out. He may have roamed up and down these two rooms for hours before he hit on his plan; and it's not unlikely that he appealed to the Deity with an occasional 'Oh, my God!' As for his using the tweezers, I'm inclined to think the mechanism of the idea came to him almost immediately.—Y' know, Sergeant, this locking of a door on the inside is an old trick. There are any number of recorded cases of it in the criminal literature of Europe. Indeed, in Professor Hans Gross's handbook of criminology there's a whole chapter on the devices used by burglars for illegal entries and exits.[1] But all such devices have had to do with the locking—not the bolting—of doors. The principle, of course, is the same, but the technic is different. To lock a door on the inside, a needle, or strong slender pin, is inserted through the bow of the key, and pulled downward with a string. But on the side door of this house there is no lock and key; nor is there a bow in the bolt-handle.—Now, the resourceful Skeel, while pacing nervously about, looking for something that
- ↑ The treatise referred to by Vance was Handbuch für Untersuchungsrichter als System der Kriminalistik.
