The boatswain produced a short steel bar from some place about his person and handed it to the hunchback. Then he braced his back against the building, directly below the desired window, and picking up Little Billy, hoisted the little fellow to his own broad shoulders. The hunchback perched there a moment and delivered instructions to Martin.

"You stand lookout," he instructed. "Watch the street. Listen for footsteps."

Martin obediently crept to the edge of the shed's roof that overlooked the street and posted himself there as watchman. The alley was on his left hand, but it was so dark there he could not see the ground. The street, just before him, was not so impervious to peering eyes.

The cobblestones and the sidewalk pavement gleamed dully. By stretching his neck, he could see the corner where the street lamp spluttered before the saloon entrance, and beyond the corner, the wide vista of the Embarcadero and a section of dark wharf. But he saw nothing threatening in the scene. Nothing moved—the street was empty of life. The only sounds were the hooting of steamboat whistles on the bay and the light rattle of Little Billy's bar against the shutter.

Then, abruptly, came from around the corner, in front of the saloon, the muffled throb of an automobile engine. It sank to a purr, and stopped. Martin stiffened tensely and gripped the revolver in his hand. Behind him, he heard the boatswain mutter:

"'Ear that, Billy? Swiggle me, 'e's back—'urry!"

The scraping sound of the steel bar upon the shutter increased in volume. Martin heard a mumble of voices, and a stamping of feet on the pavement. Then a door closed and the sounds ceased. Martin knew that several men had entered the saloon. The danger seemed to have passed them by.

He heard Little Billy give vent to a satisfied grunt. He looked up, over his shoulder, and saw that the jimmy had completed its task. The shutter was open, Little Billy was clambering down from the boatswain's shoulders, an indistinct figure was half over the sill, clambering out of the newly opened window. And in the same glance, he saw a beam of yellow light illumine the other window, the window of the room in which he had been prisoner. His ears were assailed with a sudden outcry coming through that window——

"He ees gone!"

It happened in the twinkling of an eye. Martin wheeled about at the sight and sound. He had no time for reflection, but he knew instantly that his escape had been discovered, that the light above came from the big room where he had bearded Carew, that they had opened the door and found him gone.