London's most powerful criminal is found dead and nobody knows who ordered the hit; Sean Wallace puts a stop to all criminal business in London until he finds his father's killer.

Elliot establishes a connection with a key member of the Dumani family; Sean makes a discovery about his father's murder.

The taps are off for every gang in London except Asif Afridi, so frustrated Kurdish gang leader Lale decides to hit a shipment being used to smuggle heroin.

Lale is asked to make an impossible choice; Sean begins a dangerous plan; Elliot takes on a new foe; Ed is confronted with shocking evidence of Finn and Luan's deal.

Elliot's loyalty is tested by an increasingly suspicious Ed Dumani; Sean throws a dinner to try and unite the two families; Alexander is asked to meet with an old contact.

Hidden in a farmhouse in the middle of nowhere, Darren wrestles with the chaos he's unleashed; Kinney hopes to prevent bloodshed as mercenaries sets their sights on him.