Colonel March is called into investigate the murder of a psychiatrist who had been threatened by the husband of a patient.

March's niece believes in spiritualism so when she hears her dead husband's voice and the sound of him playing the piano she believes he has returned.

A French fashion model is found murdered and dressed in mismatched colours hours after she reached out to Colonel March claiming she was being followed.

Members of the Himalayan Mountaineering Club are threatened by what appears to be an abominable snowman.

Colonel March's search for a mysterious character known only as Monsieur Z takes him to a waterfront nightclub.

Two Mona Lisa paintings appear on the art market at the same time, both claiming to be a second painted after the original, and Colonel March is recruited to help determine which is the real deal.