A powerful underworld boss, Harold Shand, is on the brink of completing an immense deal with an American Mafia organization, hoping to transform his untouchable empire in East London into a legitimate business venture. As Harold prepares to impress his American investors with a celebratory weekend on his yacht, a series of unexpected and violent events threaten to derail his plans. Bombings and murders occur with seemingly no explanation, undercutting Harold's authority and shaking his confidence. He finds himself unable to pin down who is behind the attacks. This volatile situation is exacerbated by the pressure from his American visitors, who are growing increasingly skittish about getting involved with him.

Harold’s determination to root out the traitors within his organization escalates into a full-blown, desperate investigation. As he delves deeper, Harold's world unravels at a rapid pace. His companions and closest allies are tested as they navigate layers of deception and treachery. The grim and relentless pursuit for truth takes Harold through the dark underbelly of London, exposing the volatile intersection between loyalty and ambition. Faced with mounting betrayals, Harold struggles to maintain his grip on power and ultimately confronts the devastating impact of his own brutal rise to prominence.