Billy Wallace returns to London to seek revenge. Meanwhile, someone is picking off more of Koba's associates.

Marian Wallace is forced out of hiding and made to confront his past as Koba launches a terrifying helicopter attack on his enemies

As Luan faces a desperate race against time, Ed starts to question where his own loyalties lie, and events reach an explosive climax.

The pieces fall into place for Elliot as he tries to free himself of the Investors once and for all, but manoeuvres elsewhere threaten to derail him.

As alliances are redrawn, Lale comes face to face with nemesis Asif and enters into a dangerous game of cat and mouse.

In a thrilling penultimate episode, Elliot goes after those who have wronged him, but when his plan unravels, we see what Elliot is truly capable of.

As the series races to a climax, who will emerge as winner in the battle for control of London?