A murder at a country house centres around the whereabouts of a horde of stolen diamonds and the unmasking of people who are not as they at first seem.

Believing that an unexpected inheritance will bring them happiness, a married couple instead finds their relationship strained to the breaking point.

A convicted female blackmailer is found murdered in her flat and suspicion falls on three men, all of whom the police believe may have had reason to wish her dead

An actor is murdered live on air whilst a play is being broadcast. Everyone in the play and broadcasting house fall under suspicion.