London crime boss Mick Roman is deathly ill, and time is running out to find a successor. His only options are an aging consigliere or an impulsive enforcer, but neither are suitable to take the throne.

Meanwhile, chaos reigns over the family who are coping with a paranoid ex-soldier, the return of a rebellious niece, and a drug-fuelled business meeting in Amsterdam. With deceit, ambition and infighting on the rise, this Roman empire may be about to fall.