He had not recognized Hal with the false mustache.
The game went on, but Allen took no more interest, and soon disappeared from the room.
Hal was about to follow, when a tall man stepped up to him, and tapped him on the shoulder.
"I want to have a talk with you, my friend," he said, in a low tone. "Come this way, please."
Somewhat astonished, the youth followed the man into a side apartment.
"What is it?" he asked.
"I want to know what your game is," was the cool response. "You haven't put up a cent, and that mustache of yours is false. I have an idea you are a spy."