Then the two men went to the locker, intending to drag Leo forth, gag him, and roll him up as though he were a bundle of clothes.

“Gone!” burst from Griswold’s lips.

He spoke the truth. The locker was empty.

“How did he manage it?” queried Broxton, in deep perplexity.

Griswold looked dumfounded for a moment. Then he grated his teeth in rage.

“Fools that we are!” he shouted. “To forget that he is a gymnast. Why, he must have freed himself within a minute after we locked him in.”

“By thunder! that’s so. But how did he get out of the locker?”

“I don’t know.”

“The door was locked, wasn’t it?”

“Yes.”