“A madman? I wonder,” replied the Professor slowly. “If a man who gets a fixed idea into his head, and pursues it through every difficulty, is a madman, then I agree. But in that case some of the greatest names in history must be convicted of madness. I believe that Morlandson really believed that he was executing justice. Perhaps he was. Is that document valid, Inspector?”

“I suppose so,” replied Hanslet. “It is signed, and witnessed. The signature is ‘Ernest Morlandson,’ and below that ‘Elmer Ludgrove.’ The witnesses’ signatures are opposite the latter, and the paper has been folded, so that the witnesses could see nothing but the Ludgrove signature.”

“And who are the witnesses?” asked the Professor.

Hanslet smiled. “One of them is Elizabeth Cooper, his charwoman. The other is Samuel Copperdock; the document is dated a week before that unfortunate man’s death. I think you will agree that this last touch was typical of the methods of the Black Sailor.”