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

Sean, Billy and Cornelius make a drastic attempt to reclaim London, while Luan tries to take revenge and Elliot seeks answers.

Elliot's investigation puts him on a direct collision course with the Mayor. Marian decides whether to reunite with her family.

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