DCI Cassie Stuart (Nicola Walker) and DI Sunny Khan (Sanjeev Bhaskar) investigate a cold case with alarming links to the police force. A corpse is discovered in a scrap yard. 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. Will Cassie and Sunny find themselves on the wrong side of the law? 6 episodes, 4 ½ hrs, 2 DVDS. SDH.