Homicide: Party of Twelve takes you to Jersey City where the boss where the boss of Chez Alain restaurant has just been gunned down in a drive by shooting. Frankie Fortunato, a hardworking server, moves up to become the new manager. New Jersey State Police Detective Matt Klimecki catches the case and leans heavily on the restaurant's employees to help solve the murder, including Frankie and his girlfriend, Gabby D'Angelo, who also works at Chez Alain. The plot twists and turns as Frankie struggles to please the owners and reopen the restaurant, while also dealing with the opposing forces of gun-running criminals and the authorities who are trying to catch them.