"I suppose it acts all right in every other lock?" he growled.

"Oh, yes, sir. I've been using it all the evening."

"Someone has tampered with the lock from the outside," he said savagely. "There is nothing for it but to send for the engineer. Before we're through with this business we'll pull the d—d hotel to pieces. A nice reputation the place will get if all this door-forcing appears in the papers to-morrow."

Certainly the clerk was to be pitied. Never before had the decorum of the Central Hotel been so outraged. Its air of smug respectability seemed to have vanished. Even to the clerk's own disturbed imagination the establishment had suddenly grown raffish, and its dingy paint and drab upholstery resembled the make-up and cloak of a scowling tragedian.

A strong-armed workman came joyously. He had already figured as a personage below stairs, because of his earlier experiences, and it was a cheering thing to be called on twice in one night to participate in a mystery which was undoubtedly connected with the murder in the street.

Before adopting more strenuous methods he inserted a piece of strong wire into the keyhole, thinking to pick the lock by that means; but he soon desisted.

"Some joker has been at that game before me," he announced. "A chunk of wire has been forced in there after the door was locked."

"From the outside?" inquired Steingall.

"Yes, sir. These locks work by a key only from without. There is a handle inside.… Well, here goes!"

A few blows with a sharp chisel soon cut away sufficient of the frame to allow the door to be forced open. On this occasion, there being no wedge in the center, it was not necessary to attack the hinges, and, once the lock was freed, the door swung back readily into the interior darkness.