Colonel March is called into investigate the murder of a psychiatrist, who was found dead in a seemingly sealed room.

March's niece believes her dead husband has returned as a ghost when she hears his voice and the sound of him playing the piano.

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.

A second Mona Lisa, painted six months after the original, appears on the art market and is targeted by rival collectors.