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As an elaborate joke, the wealthy Cecil Fox (Rex Harrison) hires actor William McFly (Cliff Robertson) to play his personal assistant and invites three of his old flames, including Texan socialite Mrs. Lone-Star Crockett Sheridan (Susan Hayward), to visit him. Claiming to be on his deathbed, Fox has motives that remain unclear, and things take a surprising turn when one of the guests is found dead. As Inspector Rizzi (Adolfo Celi) investigates the crime, the plot of the mystery thickens. Wikipedia