"I never heard of the fellow in my life," Philip replied pleasantly, "but don't go, Mr. Dane. You can't imagine how interesting this is to me. You have sent me a most charming acquaintance," he added, bowing to Beatrice, "and you have provided me with what I can assure you is almost pathetically scarce in these days—a new and very dramatic idea. Take a seat, won't you, and chat with us a little longer? Tell us how you came to think of all this? I have always held that the workings of a criminologist's brain must be one of the most interesting studies in life."

Mr. Dane smiled enigmatically.

"Ah!" he protested, "you mustn't ask me to disclose all my secrets."

"You wouldn't care to tell us a little about your future intentions?"
Philip enquired.

Mr. Dane shook his head.

"It is very kind of you, Mr. Merton Ware," he confessed, "to let me down so gently. We all make mistakes, of course. As to my future intentions, well, I am not quite sure about them. You see, this isn't really my job at all. It isn't up to me to hunt out English criminals, so long as they behave themselves in this city. If an extradition order or anything of that sort came my way, it would, of course, be different."

"Why not lay this interesting theory of yours before the authorities at Scotland Yard?" Philip suggested. "I am sure they would listen with immense interest to any report from you."

"That's some idea, certainly," the detective admitted, taking up his hat from the table. "For the present I'll wish you both good morning—or shall I say an revoir?"

"We may look for the pleasure of another visit from you, then?" Philip enquired politely.

The detective faced them from the doorway.