“I assure you, Monsieur President,” he cried in his sharp, clear voice, “that when I do name the murderer you will understand why I could not speak before half-past six. I assert this on my honour. I can, however, give you now some explanation of the murder of the keeper. Monsieur Frédéric Larsan, who has seen me at work at the Glandier, can tell you with what care I studied this case. I found myself compelled to differ with him in arresting Monsieur Robert Darzac, who is innocent. Monsieur Larsan knows of my good faith and knows that some importance may be attached to my discoveries, which have often corroborated his own.” Frédéric Larsan said:— “Monsieur President, it will be interesting to hear Monsieur Joseph Rouletabille, especially as he differs from me.” A murmur of approbation greeted the detective’s speech. He was a good sportsman and accepted the challenge. The struggle between the two promised to be exciting. As the President remained silent, Frédéric Larsan continued: “We agree that the murderer of the keeper was the assailant of Mademoiselle Stangerson; but as we are not agreed as to how the murderer escaped, I am curious to hear Monsieur Rouletabille’s explanation.” “I have no doubt you are,” said my friend. General laughter followed this remark. The President angrily declared that if it was repeated, he would have the court cleared. “Now, young man,” said the President, “you have heard Monsieur Frédéric Larsan; how did the murderer get away from the court?” * * * * * Rouletabille looked at Madame Mathieu, who smiled back at him sadly. “Since Madame Mathieu,” he said, “has freely admitted her intimacy with the keeper—” “Why, it’s the boy!” exclaimed Daddy Mathieu. “Remove that man!” ordered the President. Mathieu was removed from the court. Rouletabille went on:— “Since she has made this confession, I am free to tell you that she often met the keeper at night on the first floor of the donjon, in the room which was once an oratory. These meetings became more frequent when her husband was laid up by his rheumatism. She gave him morphine to ease his pain and to give herself more time for the meetings. Madame Mathieu came to the château that night, enveloped in a large black shawl which served also as a disguise. This was the phantom that disturbed Daddy Jacques. She knew how to imitate the mewing of Mother Angenoux’ cat and she would make the cries to advise the keeper of her presence. The recent repairs of the donjon did not interfere with their meetings in the keeper’s old room, in the donjon, since the new room assigned to him at the end of the right wing was separated from the steward’s room by a partition only.