The fellow struck upon his side, his temple crashing loudly against the wooden floor. Duvall stood over him for an instant, breathing heavily, convulsively, then turned and snatched the searchlight from the window sill and threw it upon the bed.

There was a trunk against the wall of the room, near the window, and about it a broad leather strap. Duvall tore the strap from its place, and in a few moments had fastened it about the chauffeur's arms and body.

A towel, knotted about his ankles, rendered him helpless. Then the detective began to search upon the floor for the bit of blue glass.

In his heart there was no joy at the victory he had just won. He had captured one of the kidnappers, it was true; but on the other hand he had, by his own carelessness, prevented the safe return of the kidnapped boy to his parents.

He pictured the father and mother, patiently waiting below for the telephone message which would never come, and wondered how he would dare to tell them the truth.

At last his nervous fingers closed upon the little glass cup, where it had rolled under the edge of the dresser when François had thrown it down. Trembling with haste, he fixed it to the searchlight which he took from the bed, and, with a hopeless feeling, approached the window, and began to wave the light frantically in the direction of Passy.

For several moments there was no response. As a matter of fact, he scarcely expected any. Then all of a sudden he saw a faint red gleam, like a star, flash from the distant night, and then go out.

He stood, helpless, waiting for it to reappear, hardly daring to hope that it would do so. Suddenly it shone again, this time for a longer period, and then disappeared. He wondered what it meant, and was scarcely surprised when the light again flashed, this time making five quick flashes, which he instantly recognized as Morse code for the letter "P." There was a brief interval, then once more the signals began to flash. This time he read them without difficulty. There were four letters, spelling the word "Help."

For an instant he leveled the tube of the searchlight toward the point from which the flashes came, guiding it by the scratches on the sill, and began pressing the button which turned the light on and off. "Where are you?" he spelled out, then waited fearfully for the reply. He dared send no other message. The person at the other end, the one who sent this ominous word, "help," must be one of the kidnappers; yet why should he signal for assistance? He could make nothing of the matter, but he reasoned that anyone calling for help would be sure to give their location, otherwise how could they expect to receive it.

For a moment the red flashes began again, and this time he began to get the numbers. There were four quick flashes and a long dash, then others in rapid succession: "4-2-R-u-e-N-i-c-o-l-o, P-a-s-s-y," the message read. "C-o-m-e q-u-i-c-k."