Then he was gone, down the hall. He side-stepped two new antagonists, and dodged into the door of a room. Before they could stop their rush, the door had slammed in their faces, and they heard the key turn in the lock.

Crash!

One of the Federal agents, a powerful man, hurled himself against the barrier. Another joined him; and after several terrific blows, the door gave way and the men were precipitated into the room.

The others were behind them. Their flashlights gleamed; but the room was empty. One man flung the window sash upward.

There was an alley below, and a heavy-set policeman was standing by a lamp-post, staring upward. He held a revolver in one hand.

“Don’t shoot!” warned the man at the window.

“Who are you?”

“Federal agents. On a raid.”

The man leaned out of the window and drew back his coat to show his badge.

“Need any help?” asked the officer.