Gina and Lello set sail on a cruise with little Nino and tough Commissioner Di Mauro. While planning a casino heist, they get caught up in a diamond theft and face wild adventures. The con artists lose their stolen loot and must also care for Nino, whose parents are missing in Africa.

Gina and Lello, compelled to look after little Nino, attempt to con customers at Marco and Brigitte's restaurant. However, they mistakenly target the wrong victim, attracting the attention of an organized crime ring. Additionally On top of that, Nino, nearly placed in foster care, inadvertently causes them to lose the money they swindled from a wealthy woman infatuated with Lello.

Gina and Lello take Nino to a Roman museum, where Gina unexpectedly meets her ex, Max. He lures them into a plan to steal art. Nino befriends Federico, the museum director's son. The heist fails, and Max kidnaps Federico to secure the painting. Di Mauro catches Gina and Lello with a counterfeit work of art during a hotel search, thinking it's the original. How will they handle this complicated situation?

Gina and Lello are about to say goodbye to Nino as his parents return from Africa. However, they unexpectedly join Nino in searching for Marco and Brigitte, who have been kidnapped, with Commissioner Di Mauro pursuing them. Young Nino cleverly resolves the situation (FLAG: too much plot revealed?) while Di Mauro seeks a reason to arrest Gina and Lello.