It all begins when Cosmo Topper, a law-abiding, mild-mannered bank manager, decides to buy a secondhand car, only to find it haunted by the ghosts of its previous owners: the reckless, feckless, frivolous couple who met their untimely demise when the car careened into an oak tree. The capricious ghosts make it their mission to rescue the inhibited banker from the staid "summer of suburban Sundays" that is his life. With their ectoplasmic reappearances and whimsically insane actions, they leave Topper, and anyone else who crosses their path, in a whirlwind of discomfiture and delight. Smith's hilarious ribald comedy was the basis for a Cary Grant movie and hit television show.