The film tells the difficult love-story between Bobby Tonner, an American singer who came to Naples to meet his old music professor, and the charming daughter of the same professor.

Two young people fall in love and run away from home. They soon run out of money and he, who has a decent voice, finds work in a low-class variety show, where he is captivated by the charms of a dancer.

Jupiter decides to spend his 3,000th birthday on earth amongst the humans. Mercury suggests he take the place of a newly married politician so he can have some fun with the man's new wife - but nothing goes to plan!