"Can't smoke—dare not sleep," he grunted. "And it'll be hours before I can get out of here. This is one sweet game I'm playing! But there'll be a handsome profit in it, all right!"

The hours passed. In the big museum below visitors came and went, passing beneath the scrutiny of the guards and the police. Five o'clock came, and the rooms were cleared. Guards searched them well, made sure nobody was inside the building except those who had a right to be there. The custodian and his assistants left. The big doors were locked. Night guards and policemen remained, walking through the rooms. Down in the basement an engineer threw a big electric switch that sent a powerful current through the frames that guarded the priceless objects of art.

Much had been made of that scheme of protection in the newspapers. When that current was turned on, any person touching one of the paintings would be rendered unconscious immediately. Moreover, an alarm would be sounded in the building, another flashed to police headquarters, another to the sheriff's office.

"The Black Star will never tackle this place," said one of the policemen to a guard. "He's going after something else. His gang couldn't get near the building without the men outside spotting them, and we could put up a scrap and keep them out until help came from headquarters."

"I think he'll tackle the private collection of some millionaire," replied the guard. "I don't see how he could hope to get in here and get away with anything."

Outside the building, police paced beats beneath bright lights that illuminated every door and window. Inside, more police and the regular museum guards talked and smoked and wished the long night was over.

Up in the attic, a perspiring elderly gentleman, who was elderly no longer because he had removed a very clever wig, and perspiration had ruined his make-up, looked at the radium dial of his watch and grunted that, at last, the time had come. It was nine o'clock.

He got up and made his way slowly and carefully across the attic through the dust to the trapdoor. He lifted it a fraction of an inch and looked down.

The statuary hall was dark save for a small incandescent light that glowed in the wall near the door. No guard or policeman was in sight, and the door leading to the corridor was closed.

The trapdoor was opened wide, and the man dropped to the floor, making not the slightest sound as he struck. He had removed his shoes in the attic, and had put on a pair of rubbers. He darted behind a statue, and listened, and wiped the perspiration from his face.