"From what?" demanded Mrs. Fane angrily.
"From participation in the murder of this poor----"
"How dare you come and accuse me," she burst out furiously. "You must be mad!"
"I have proofs which will prove my sanity," said Bocaros, moving to the door. "But I can show them to Derrick."
Mrs. Fane intercepted him. "Stop where you are," she said sharply. "This matter must be sifted to the bottom. Afterwards I shall go with you myself to the police-station. If you cannot prove what you have said, I shall have you arrested for threatening language."
"Oh, I can prove everything," said Bocaros, returning to his seat. "And since we now understand one another, we can proceed."
"You will proceed," retorted Mrs. Fane, sitting down also, to answer my questions, "or you will get into trouble, my good man. You say that Mr. Calvert was in this room on the night of the murder?"
Bocaros nodded, sure of his ground. "He left this house at eleven. He was in his stage dress and spoke to the policeman. He dropped the latch-key, and murdered----"
"Stop. You can't be sure that he did. The woman was murdered earlier. During the evening Mr. Calvert was at the theatre."
"No. His part was played by his understudy up till half-past nine. He then played in the last act and came here. He came here earlier," insisted the professor, "and murdered the woman to get the money."