Whilst helping out the drugs squad on a bust, Ronnie and Joe stumble upon a body that has been hidden inside the boot of a car in the Thames. It turns out that the man was Taylor Kane, a black undercover policeman who went missing in the 1980s during the Brixton riots. DI Leyton finds himself personally putting his head above the parapet when he gets an unexpected visit from the Commissioner. Accusations of are thrown around as our heroes get in deeper and deeper when the case hits the headlines, it's time to pick a side as loyalties are tested and careers are put on the line for justice.