Carlo Banci, anagraphically known as Rosario, is a former police constable in Ischia. Once retired, he decides to open a restaurant. In his new venture, Carlo is partnered with three "acquaintances" of his, who he got jailed in the past: poison murderer Castagna, forger Margherita and robber Antonio. The grumpy but golden-hearted chef, who never lost his passion for justice and for upholding weak people's rights, collaborates indirectly to investigations of criminal cases led by his policeman adopted son Francesco.