London has changed. The elusive Investors have installed a new ruling force in London, but the old guard are not playing by the rules and brutal gang leader Koba goes to terrifying lengths to smoke out the rebels.

Billy Wallace is living a dream life in Italy but is lured back to London to seek revenge on Elliot, determined to make the man who murdered his brother pay. Pressure mounts on Koba as more of his associates are killed and he tightens the screws to stamp out rebellion.

Marian finds herself forced to reconsider everything she has built over the last year when new allegiances clash with the old. Meanwhile, Lale is hiding in plain sight in London, and Koba launches a terrifying helicopter attack on his enemies.

Luan faces a race against time that ends in a violent showdown; Ed starts to question if he's backed the right horse; Elliot's world collides with Shannon's; Billy makes a grave decision about his place in the gang world; Koba has an volatile encounter with a new foe.

Elliot is on the cusp of freeing himself and his father from the Investor stranglehold, but when Shannon Dumani comes to him with an urgent problem, events threaten to derail him. Meanwhile, Asif issues Koba with an ultimatum that could backfire.

With battle lines redrawn, Asif makes a ruthless business deal that brings him face to face with his nemesis Lale and a dark game of cat and mouse begins. Marian fights to secure the future of the Wallaces.

In a thrilling penultimate episode, Elliot goes after those who have wronged him, but when his plan dangerously unravels, Elliot makes a shocking and strategic decision that exposes what he is truly capable of. Billy makes a shocking discovery which forces Marian hand.

As the series races to a climax, Elliot's conflict reaches an exhilarating denouement, Shannon makes a grasp for power and Marian stands to lose everything. As Koba faces his biggest threat yet, who will emerge as winner in the battle for control of London?