Alfredo is a crude Roman motorcycle repairman who is a friend of Count Max, a gentleman and ex-pleasure lover. The latter invites Alfredo to his residence in Campo dei Fiori and teaches him etiquette, French and how to play poker. The laughter will begin when Alfredo meets and chases the beautiful model Isabell Bellissima in Paris.
While keeping an eye on his small time crook brother in law, Inspector Nico Giraldi gets involved in a murder case set in the world of Formula One racing. Giraldi is suspended for trying to cover up for his brother in law and becomes afraid his wife and son may be targeted next. Therefore he calls in the help of his childhood friend and chief informant, Venticello.