Howard St. John

Having met on a train, a smooth-talking psychotic socialite shares his theory on how two complete strangers can get away with murder to an amateur tennis player — a theory he plans to test out.

C.R. MacNamara is a managing director for Coca Cola in West Berlin during the Cold War, just before the Wall is put up. When Scarlett, the rebellious daughter of his boss, comes to West Berlin, MacNamara has to look after her, but this turns out to be a difficult task when she reveals to be married to a communist.

Jerry Webster and Carol Templeton are rival Madison Avenue advertising executives who each dislike each other’s methods. After he steals a client out from under her cute little nose, revenge prompts her to infiltrate his secret "VIP" campaign in order to persuade the mystery product’s scientist to switch to her firm.