Peter Ruff and the Double Four by E. Phillips Oppenheim

It was about this time that Peter Ruff found among his letters one morning a highly-scented little missive, addressed to him in a handwriting with which he had once been familiar. He looked at it for several moments before opening it. Even as the paper cutter slid through the top of the envelope, he felt that he had already divined the nature of its contents.

FRIVOLITY THEATRE