“My theory, based on the evidence of the shots that were heard at midnight, demanded two shots—one which wounded the murderer at the time of his attack, and one fired at the time of the nightmare. The evidence given by the Berniers before the examining magistrate was to the effect that only one shot had been heard. Monsieur Stangerson testified to hearing a dull sound first followed by a sharp ringing sound. The dull sound I explained by the falling of the marble-topped table; the ringing sound was the shot from the revolver. I was now convinced I was right. The shot that had wounded the hand of the murderer and had caused it to bleed so that he left the bloody imprint on the wall was fired by Mademoiselle in self-defence, before the second phase, when she had been really attacked. The shot in the ceiling which the Berniers heard was the accidental shot during the nightmare.
“I had now to explain the wound on the temple. It was not severe enough to have been made by means of the mutton-bone, and Mademoiselle had not attempted to hide it. It must have been made during the second phase. It was to find this out that I went to The Yellow Room, and I obtained my answer there.”
Rouletabille drew a piece of white folded paper from his pocket, and drew out of it an almost invisible object which he held between his thumb and forefinger.
“This, Monsieur President,” he said, “is a hair—a blond hair stained with blood;—it is a hair from the head of Mademoiselle Stangerson. I found it sticking to one of the corners of the overturned table. The corner of the table was itself stained with blood—a tiny stain—hardly visible; but it told me that, on rising from her bed, Mademoiselle Stangerson had fallen heavily and had struck her head on the corner of its marble top.
“I had still to learn, in addition to the name of the assassin, which I did later, the time of the original attack. I learned this from the examination of Mademoiselle Stangerson and her father, though the answers given by the former were well calculated to deceive the examining magistrate. Mademoiselle Stangerson had stated very minutely how she had spent the whole of her time that day. We established the fact that the murderer had introduced himself into the pavilion between five and six o’clock. At a quarter past six the professor and his daughter had resumed their work. At five the professor had been with his daughter, and since the attack took place in the professor’s absence from his daughter, I had to find out just when he left her. The professor had stated that at the time when he and his daughter were about to re-enter the laboratory he was met by the keeper and held in conversation about the cutting of some wood and the poachers. Mademoiselle Stangerson was not with him then since the professor said: ‘I left the keeper and rejoined my daughter who was at work in the laboratory.’
“It was during that short interval of time that the tragedy took place. That is certain. In my mind’s eye I saw Mademoiselle Stangerson re-enter the pavilion, go to her room to take off her hat, and find herself faced by the murderer. He had been in the pavilion for some time waiting for her. He had arranged to pass the whole night there. He had taken off Daddy Jacques’s boots; he had removed the papers from the cabinet; and had then slipped under the bed. Finding the time long, he had risen, gone again into the laboratory, then into the vestibule, looked into the garden, and had seen, coming towards the pavilion, Mademoiselle Stangerson—alone. He would never have dared to attack her at that hour, if he had not found her alone. His mind was made up. He would be more at ease alone with Mademoiselle Stangerson in the pavilion, than he would have been in the middle of the night, with Daddy Jacques sleeping in the attic. So he shut the vestibule window. That explains why neither Monsieur Stangerson, nor the keeper, who were at some distance from the pavilion, had heard the revolver shot.
“Then he went back to The Yellow Room. Mademoiselle Stangerson came in. What passed must have taken place very quickly. Mademoiselle tried to call for help; but the man had seized her by the throat. Her hand had sought and grasped the revolver which she had been keeping in the drawer of her night-table, since she had come to fear the threats of her pursuer. The murderer was about to strike her on the head with the mutton-bone—a terrible weapon in the hands of a Larsan or Ballmeyer; but she fired in time, and the shot wounded the hand that held the weapon. The bone fell to the floor covered with the blood of the murderer, who staggered, clutched at the wall for support—imprinting on it the red marks—and, fearing another bullet, fled.
“She saw him pass through the laboratory, and listened. He was long at the window. At length he jumped from it. She flew to it and shut it. The danger past, all her thoughts were of her father. Had he either seen or heard? At any cost to herself she must keep this from him. Thus when Monsieur Stangerson returned, he found the door of The Yellow Room closed, and his daughter in the laboratory, bending over her desk, at work!”
Turning towards Monsieur Darzac, Rouletabille cried:—
“You know the truth! Tell us, then, if that is not how things happened.”