Now he pocketed the revolver and the blue-print--gagged Anderson rapidly with a knotted handkerchief and proceeded to wrap his own muffler around the detective's head as an additional silencer.

Anderson gave a faint sigh.
The Doctor thought rapidly.

Soon or late the detective would return to consciousness--with his hands free he could easily tear out the gag.
He looked wildly about the room for a rope, a curtain--ah, he had it--the detective's own handcuffs! He snapped the cuffs on Anderson's wrists, then realized that, in his hurry, he had bound the detective's hands in front of him instead of behind him.

Well--it would do for the moment--he did not need much time to carry out his plans.

He dragged the limp body, its head lolling, into the billiard room where he deposited it on the floor in the corner farthest from the door.
So far, so good--now to lock the door of the billiard room.
Fortunately, the key was there on the inside of the door.