In the first episode, DI Gabriel (Chiwetel Ejiofor) has just returned to work after being shot on an undercover job; his partner was killed and Gabriel suffers amnesia with a bullet lodged in his head. He leads the police investigation of the murdered drug baron Harvey Wratten and finds himself in a race with the other side of the line, the drug dealers who want to know who killed their boss.

The driver of Wratten's car is identified, and Gabriel and Joseph Bede are desperate to get to him first, but they find themselves in a three-horse race with a shadowy figure that always seems to be one step ahead of them.

Bede reluctantly finds himself in the driving secret of the drugs cartel. Meanwhile Gabriel continues to investigate the Wratten murder against his superior's instructions, and Honey discovers a secret.

Jay Wratten's insistence that Bob Harris is responsible for his uncle's murder causes problems for Bede's new business deal. Meanwhile Gabriel struggles to placate his ex-mistress and Gatehouse shows he'll go to great lengths to find Glickman.

Gatehouse finally tracks Glickman down with explosive consequences. Gabriel gets closer to finding out why he got shot and there's help for Bede's floundering business deal from an unexpected direction.

Gabriel uncovers some dark truths about Counterpoint which implicate his colleagues and Glickman warns him that Gatehouse will hunt him down. Bede gets one step closer to finally getting out of the drugs game.

Bede desperately tries to complete the final drug deal as his wife's condition deteriorates rapidly, while Gabriel is inexorably drawn to a shocking confrontation with Gatehouse.