 Flamboyant television chef Dexter Paris and his twin brother, Norman, a conservative banker, are supposedly not talking to one another. But both disapprove of their wealthy uncle Clifford s impending marriage to a young woman. One of them enters Clifford s bathroom and drops an electric mixer with a frayed power cable into Clifford s bath water. Clifford is electrocuted, and the murderer takes Clifford s body to an exercise room to make it appear that Clifford died of a coronary. But Lieutenant Columbo, the infallible, cunning detective in a rumpled raincoat, suspects foul play and believes that the Paris twins, both heirs to their uncle s estate provided he didn t marry, had a motive for murder. But which one did the deed? Columbo pursues both with incessant questions as he tries to determine which of the two brothers killed their uncle Clifford.