The Gamache, tailors from father to son, have dressed the Paternò mafia family for three generations. Their children come from the same neighborhood, from the same schools. Vincent "Vince" Gamache (Marc-André Grondin) works for the sponsor Frank Paternò (Sergio Castellitto) and his eldest son Giaco (Donny Falsetti), while his sister Sofie (Mylène Mackay) attends Patrizio (Michael Ricci), the youngest of the Paternò family. Vince, reckless and impetuous, mounts a big hit to impress the godfather, fanning the jealousy of Giaco. The war breaks out. Everyone must choose their side, Paternò or Gamache. On both sides, there is a price to pay. A colossal price… Based on the non-fiction book Mafia Inc: The Long, Bloody Reign of Canada's Sicilian Clan by journalists André Cédilot and André Noël.