A very clever detective is on a mission to find a shipowner's daughter, having as a sole research element a mole on the girl's buttock.

A good-hearted guy, Romeos, who thinks he's a big "Kazanova", comes out of the madhouse. At the suggestion of his cousin Leon Karfis, he goes on holiday to an island where he is continuously under the watchful eye of a nurse of the madhouse, Telemachus.