The BAFTA-winning hit series returns, as DCI Cassie Stuart and DI Sunny Khan investigate a cold case with alarming links to the police force. A corpse is discovered in a scrapyard. Four suspects emerge; all have links to the law and attended the same police training course back in 1989. Since then their lives have gone in very different directions. But exactly who is fighting for justice? Can the police force ever really be trusted? And will Cassie and Sunny find themselves on the wrong side of the law?

Wide screen.