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Christine Riverton Duncan (Esther Williams) attempts to play matchmaker for her lovelorn friend Ellen (Paula Raymond) by pursuing Douglas J. Morrissen, Jr. (John Lund), the man Ellen loves, all the way to Idaho. There, Christine decides to play a joke on Douglas. After boarding his train to Sun Valley, Christine wins the man's affections and then shocks him with hints that she expects a commitment. Once she's in Sun Valley, however, things become problematic when Christine falls in love with hotel bandleader Dick Layne (Van Johnson). During her time in Sun Valley, Christine wins the title of "Duchess of Idaho" in a dance contest.