“Well?”
“I will take Monsieur Destange to the château de Crozon, and it will be easy for him, who knows the nature of the work performed by Arsène Lupin in the restoration of the Château, to discover the secret passages constructed there by his workmen. It will thus be established that those passages allowed the blonde Lady to make a nocturnal visit to the Countess’ room and take the blue diamond from the mantel; and, two weeks later, by similar means, to enter the room of Herr Bleichen and conceal the blue diamond in his tooth-powder—a strange action, I confess; a woman’s revenge, perhaps; but I don’t know, and I don’t care.”
“Well?”
“After that,” said Herlock Sholmes, in a more serious tone, “I will take Monsieur Destange to 134 avenue Henri-Martin, and we will learn how the Baron d’Hautrec——”
“No, no, keep quiet,” stammered the girl, struck with a sudden terror, “I forbid you!... you dare to say that it was I ... you accuse me?...”
“I accuse you of having killed the Baron d’Hautrec.”
“No, no, it is a lie.”
“You killed the Baron d’Hautrec, mademoiselle. You entered his service under the name of Antoinette Bréhat, for the purpose of stealing the blue diamond and you killed him.”
“Keep quiet, monsieur,” she implored him. “Since you know so much, you must know that I did not murder the baron.”
“I did not say that you murdered him, mademoiselle. Baron d’Hautrec was subject to fits of insanity that only Sister Auguste could control. She told me so herself. In her absence, he must have attacked you, and in the course of the struggle you struck him in order to save your own life. Frightened at your awful situation, you rang the bell, and fled without even taking the blue diamond from the finger of your victim. A few minutes later you returned with one of Arsène Lupin’s accomplices, who was a servant in the adjoining house, you placed the baron on the bed, you put the room in order, but you were afraid to take the blue diamond. Now, I have told you what happened on that night. I repeat, you did not murder the baron, and yet it was your hand that struck the blow.”