It pleased me to hear the lad speak out so roundly, and yet I knew that the facts were against him, and that he was incapable of taking an unprejudiced view of the situation.

“I only speak as an outsider,” said I. “And now I must leave you, for I have a long walk before me. Your story has interested me so much that I should be glad if you could let me know the sequel.”

“Leave me your card,” said he; and so, having bade him “good-night,” I left him.

I heard nothing more of the matter for some time, and had almost feared that it would prove to be one of those fleeting experiences which drift away from our direct observation and end only in a hope or a suspicion. One afternoon, however, a card bearing the name of Mr. J. H. Perceval was brought up to my office in Abchurch Lane, and its bearer, a small dry, bright-eyed fellow of fifty, was ushered in by the clerk.

“I believe, sir,” said he, “that my name has been mentioned to you by my young friend, Mr. Felix Stanniford?”

“Of course,” I answered, “I remember.”

“He spoke to you, I understand, about the circumstances in connection with the disappearance of my former employer, Mr. Stanislaus Stanniford, and the existence of a sealed room in his former residence.”

“He did.”

“And you expressed an interest in the matter.”

“It interested me extremely.”