Bruno Fioretti, known as "Mandrake", is an inveterate gambler who never misses a day at the horse racing track in Rome. He is doubly unlucky: he bets too much on one horse, and his wife is sleeping with his best friend because Mandrake is always at the track. Penniless and cuckolded, Mandrake decides to make one last bet.
Romeo and Felice lead two rival bands who constantly make fun of each other. One day, Romeo meets and falls in love with Giulietta, without knowing that she is Felice's sister.
Eduardo accidentally discovers that he is adopted. His real father is dying, but before his death he said that his mother was the "Queen of England", failing to clarify that this is the nickname of Italian prostitute. But Eduardo is already rushing to the capital of England...
