C. O. D.

C. O. D.: Washington, D.C. society is shocked when Lois Tremaine's fiancé James Donaldson is strangled in the theater seat beside her while they watched Macbeth on the night before their wedding. Doctor Leonard McLane, a rival for Lois' hand (and seated in the row ahead of them) vows to solve the police-baffling mystery, but as he begins to uncover a trail of espionage in Donaldson's past, the body count rises, with the crimes being connected only by the presence of a C.O.D. package label at each scene.