Socialite Elvira Kent (Janis Paige) asks nightclub singer Georgia Garrett (Doris Day) to take her place on an expensive cruise so she can stay home and catch her husband cheating. But neither woman is aware that Elvira's husband is also keeping an eye on his wife. A private detective keeps tabs on Georgia's every move, believing that she is Elvira in this farce-filled Hollywood musical, which marked Day's debut on film.