Harry (Fred MacMurray) and his wife, Katie (Jane Wyman), save up for years to take their family on a trip to Europe. Once aboard ship, however, their vacation is anything but relaxing. Daughter Amy (Deborah Walley) falls for young philanderer Nick (Michael Callan), Katie unwittingly enraptures the dashing Rudolph (Ivan Desny) and son Elliot (Tommy Kirk) is about to lose his heart as well.