"Get through that door!" the chief shrieked. "We've got him in a trap!"
"I wouldn't be too sure of that," said Roger Verbeck. "He seemed to speak with confidence."
"The Black Star used to be noted for doing some peculiar and seemingly impossible things," Verbeck reminded the chief.
"I want to be the second man through that door!" Muggs said. "I got it comin' to me, boss. You ain't let me do a thing to-day, and I want to get my hands on that big crook!"
"That's what we all want to do," the chief remarked. "Get ready, men; that door will be open in a minute!"
The detective had succeeded in cutting a hole in it. Now he put his face close to the aperture and looked out. He could see nothing but darkness. Cautiously, he extended a hand and felt for the bolt, located it, shot it back. He whispered the news to those behind him. The officers crowded the steel stairs, and Muggs got well in the van. Muggs declined to be sidetracked longer.
The detective threw the door open, and they stumbled up the steps and to the roof, their weapons held ready, to dart to either side, expecting a shot, or a vapor bomb at least.
Their electric torches flashed, and the roof was bathed in light. There was nothing behind which a person could hide, except two chimneys. The officers approached the chimneys, carefully, ready for instant combat. They circled them--and found nobody.
"He's here--got to be here!" the chief cried.
They rushed to all the fire escapes and found that nobody was on them. They shouted to officers in the street below, and were told that the fire escapes had not been used. They searched every square foot of the roof, looked along the parapet, found nobody.
"I tell you that crook's got to be here!" the chief shouted. "How could he get away?"
"Airplane," one of the detectives suggested.
"Don't be an ass!" the chief shrieked. "An airplane makes a lot of noise. And it wouldn't be easy to pick up a man from a roof in the dark, you fool! The only way it could be done would be to trail a rope and let him grab it, and that would mean a dead man on the pavement below. You ass, an airplane travels with speed!"
"Well, he doesn't seem to be here," Verbeck offered.
"But where could he have gone?" the chief cried. "Even the Black Star can't make himself invisible at will!"