The latter, revolver in hand, commanded him sharply to throw up his hands.

The chauffeur did so—thereby directing the light of the electric lamp toward the ceiling. The sudden change from the glare which an instant before had been in his eyes, to almost total darkness, left Duvall momentarily blind. His eyes could not instantaneously respond to the withdrawal of the light. The figure of the chauffeur appeared but a dark and formless shadow.

The latter, however, not having faced the glare of the light, was able to see without difficulty. With lightning like quickness he spun around on one foot, until his back instead of his face was toward the detective. Then his right foot rose, in the famous and deadly blow of the savate.

It has been said that this backward kick, so dear to the heart of the Parisian crook, is more to be feared than any possible onslaught in good old Anglo-Saxon style with the fists. Certainly in this instance it was too much for Richard Duvall. The unexpected blow, coming during the moment when the sudden darkness had left him blinded and confused, sent him crashing back into the depths of the closet, buried beneath a mass of clothing. His arms, entangled in falling coats and waistcoats, were helpless. The revolver flew from his hand, and lay useless on the floor.

The chauffeur went about his business calmly. His first move was to direct the searchlight carefully into the interior of the closet, slipping the blue cup from the end of it as he did so and allowing it to fall unheeded to the floor. His second was to draw a long and peculiarly deadly looking knife.

His quick eye saw at once that the revolver was no longer in the detective's grasp. His searchlight enabled him to discern it, lying on the floor to one side of the closet. Before Duvall could extricate himself from the articles of clothing in which he was entangled, François had stooped quickly, picked up the revolver, and slammed the door of the closet upon him. As he struggled to his feet, the detective heard the click of the key as it turned in the lock. He was a prisoner.

Without losing a moment, the chauffeur tossed the revolver upon the table, took up the cup-shaped bit of red glass, fitted it to the tube of the searchlight, and, going to the south window, placed it upon the sill in such a way that its crimson glare was directed almost due south. It was evident that the position in which the light was placed was marked by the two tiny scratches cut in the woodwork of the window sill. In a moment he had turned back toward the closet door.

Duvall, meanwhile, realized that only by instant and superhuman effort could he hope to remedy the frightful situation which his unlucky movement had precipitated.

He braced his shoulders and back against the rear wall of the closet, put his two feet against the door, and with every atom of strength in his body strove to force it open.

His movements had been quick. Just as the chauffeur turned back from the window toward the room, Duvall, his muscles knotted with effort, drove the full force of his body against the closet door.