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?

Part 1: When Finn Wallace is assassinated, his son Sean puts a stop to all criminal business in London until he finds out who killed him. Meanwhile, unknown Wallace henchman Elliot rises through the ranks when he recovers Finn's missing driver.

Part 2: When Finn Wallace is assassinated, his son Sean puts a stop to all criminal business in London until he finds out who killed him. Meanwhile, unknown Wallace henchman Elliot rises through the ranks when he recovers Finn's missing driver.

The taps are off for all gangs in London except Asif Afridi, so frustrated Kurdish gang leader Lale decides to hit a shipment of his cows that are being used to smuggle heroin. Sean unleashes his fury after he makes a discovery about his father's murder.

Lale is asked to make an impossible decision. Will she choose her homeland or her family? Sean enacts a dangerous plan. Elliot takes on a new foe. Ed is confronted with shocking evidence of Finn's deal with Luan.

Elliot's loyalty is tested by an increasingly suspicious Ed Dumani. Sean throws a dinner in an attempt to unite the two families. Alexander is asked to meet with some of Finn's old contacts.

Hidden safely away in a farmhouse in the middle of nowhere, Darren wrestles with the chaos he has unleashed; but when a mysterious group of mercenaries set their sights upon him, will Kinney be able to get there in time to prevent bloodshed?

With the Wallaces retreating to a safehouse, Marian puts the pressure on Sean to uncover Finn's killer - and Sean wrestles with who he has become. How far is he prepared to go in pursuit of the truth? Meanwhile, Elliot's recuperation is interrupted by a new danger.

The truth about Finn's murder is revealed - and The Wallaces and The Dumanis will never be the same again. Meanwhile, Luan is forced to confront the deadly consequences of his actions. Elliot provides Vicky with enough information to make her move.

With the stakes higher than ever, the Wallaces are forced to go into hiding. Luan risks his life to rid himself of Mosi. Floriana seizes an opportunity. Elliot attempts to save the life of a colleague.

Old scores are settled. New alliances are forged. Lives are lost. Elliot is forced to make a choice that will define his entire future, and Sean makes a discovery about a traitor who has been in his midst all along.