Inspector Cassin, a renowned Paris detective, departs to the country for a much-needed break. There he falls in love with the innkeeper’s daughter, Nanette, who is already betrothed to a local farmer. On the evening of their engagement party, Nanette and the farmer both disappear. Cassin takes up the case immediately to discover what happened to them and who is responsible.

The health conscious, dairy-farming Higgins family begin each day with an invigorating swim. One day, traveling health-tonic salesman, Windy Weebe, comes to town and suggests they could swim the English Channel. Sponsored by "Liquapep" and coached by Windy, the family arrive in Europe. There it is decided that daughter Katie is the only one strong enough to enter the contest. But while she should be focused on the difficult and risky task ahead, Katie is pursed by dashing Frenchman, André Lanet... This comedic musical is well remembered for the scene when Katie dreams she is swimming with cartoon characters Tom & Jerry!