When Elliot's drug shipment is spiked, rocking the Gangs and causing hundreds of deaths, the hunt is on for who is responsible.

Luan takes drastic action to defend his family. Elliot uncovers a piece of the spiking mystery. But will it cost him everything?

A showdown between Elliot and Zeek leads to a shocking discovery. Has Elliot been looking for answers in the wrong places?

Elliot places his trust in a surprising ally to uncover the truth. Ed meets an old contact, as events build to a Gangs showdown.

The extent of the conspiracy is revealed. Elliot's past and present collide and the Gangs take revenge, changing London forever.