"It is my business to know, Monsieur. Let it suffice that I do know. If you hope ever to see your child again, you had better listen to what I have to say, and carry out my instructions to the letter." His voice was harsh, menacing.

Mr. Stapleton directed him by a gesture, to proceed. He was too angry to speak.

"Tomorrow night at this hour—eight o'clock—I shall come here, to this house, and ask for you. You will hand me a package containing one hundred thousand dollars. I will examine the money here, and satisfy myself that the amount is correct.

"I shall then leave the house, and walk to the Arc de Triomphe; which, as you know, is but a short distance away. At the Arc de Triomphe, I shall wait for an automobile, which will stop for me. In that automobile I shall drive away. If I get away safely without interference, there will be telephoned to your house, within half an hour, the address of the place where your boy is to be found. If I do not get away safely, that address will not be telephoned to you, and you will not see your child alive again. This is your last chance, Monsieur. It is most important, I assure you, that nothing should happen to prevent my safe departure tomorrow night."

For a moment Grace was undecided as to how she should act. She feared greatly, under the circumstances, to make any move which would endanger the safety of Mr. Stapleton's child. Yet her duty, as an agent of the police, was clear. She must use every effort to effect this man's capture, before he left the house.

She knew that she could not reach the street without passing the door of the reception room, in which case both Mr. Stapleton and his caller would see her. There was nothing to do but telephone. She flew to a small alcove room which opened off the rear of the library, in which she knew the telephone instrument was located. Once in this small room, she closed the door, for fear the others might overhear her, then called up the Prefecture. Monsieur Lefevre was out; but she acquainted one of his assistants with the circumstances, and requested him to send a man to the house at once.

It would take at least ten minutes, perhaps more, for the man from the Prefecture to reach the house even though he came by automobile, as he no doubt would. What should she do, to keep the man in the reception room from leaving before the police should arrive?

The question was solved for her, quite unexpectedly. In opening the door of the small room, to re-enter the library, she accidentally struck against a chair. The sound aroused both Mr. Stapleton and his visitor. The former, who had, in his excitement, completely forgotten Grace's presence, appeared at once in the doorway between the two rooms. "Come here, Miss Goncourt," he said sternly.

Grace entered the reception room. The man with the black beard eyed her keenly. "Ah—a representative of the police, I believe. Our conversation has been overheard, then, Monsieur Stapleton?"

The banker was violently angry. He turned to Grace. "You have heard?" he demanded.