Despite his hesitation and his fear of exceeding his instructions from the head of the detective service, the chief-inspector was powerless to throw off the ascendancy which Rénine had acquired over him. He left the room.
Rénine turned to Hortense:
"Do you understand my plan of battle?"
"Yes," she said, "but it's a dangerous experiment. Do you think that Dutreuil will fall into the trap?"
"Everything depends on the state of his nerves and the degree of demoralization to which he is reduced. A surprise attack may very well do for him."
"Nevertheless, suppose he recognizes by some sign that the box has been changed?"
"Oh, of course, he has a few chances in his favour! The fellow is much more cunning than I thought and quite capable of wriggling out of the trap. On the other hand, however, how uneasy he must be! How the blood must be buzzing in his ears and obscuring his sight! No, I don't think that he will avoid the trap.... He will give in.... He will give in...."
They exchanged no more words. Rénine did not move. Hortense was stirred to the very depths of her being. The life of an innocent man hung trembling in the balance. An error of judgment, a little bad luck ... and, twelve hours later, Jacques Aubrieux would be put to death. And together with a horrible anguish she experienced, in spite of all, a feeling of eager curiosity. What was Prince Rénine going to do? What would be the outcome of the experiment on which he was venturing? What resistance would Gaston Dutreuil offer? She lived through one of those minutes of superhuman tension in which life becomes intensified until it reaches its utmost value.
They heard footsteps on the stairs, the footsteps of men in a hurry. The sound drew nearer. They were reaching the top floor.
Hortense looked at her companion. He had stood up and was listening, his features already transfigured by action. The footsteps were now echoing in the passage. Then, suddenly, he ran to the door and cried: