“Have your revolver ready,” Chick added. “If Mack makes any such move as that, give him a drop shot on the instant.”

“Drop shot is right,” muttered Patsy, scowling. “I’ll drop him so he’ll never rise again.”

“That’s all. We shall down that door within five minutes.”

“Go ahead. I’ll do my part.”

Chick glided away in the darkness, followed by the two detectives.

Patsy crept to the window again, revolver in hand, where he crouched to gaze and listen.

David Mack was speaking.

“There now is nothing to it, Carter,” he was snarling bitterly, no longer in disguise. “You have put me in a position that leaves me no alternative. I must wipe you out of existence.”

Nick Carter sat gazing sternly from one to another.

“You put yourself in the position you are in, Mack,” he coldly answered. “If you think you can remedy it by killing me—well, that’s up to you.”