Creasey was an extraordinarily prolific writer, releasing titles under his own name and under a number of pen-names; this one was originally published in 1946 under the name Norman Deane. The plot gets pretty complicated and a little silly (robbery, murder, a mysterious playscript--"indecent" in some unspecified way), but the whole thing is great fun to read. My work-addled brain drank it up greedily.