DCI Cassie Stuart and DS Sunny Khan investigate when a skeleton is found beneath a derelict house. A set of car keys lead the pair on a trail to identify the victim, and they find a diary of a young man missing since 1976. UK Edition.

After identifying the body as Jimmy Sullivan, the hunt for his murderer begins. Cassie and Sunny identify 'Frankie C' as Sir Phillip Cross -- a government czar; and 'Beth' is Lizzie Wilton, who also denies knowing Jimmy. UK Edition.

The investigation into Jimmy's death reveals marks on his body consistent with known gangland torture methods. Cassie and Sunny question Sir Phillip about his past involvement with a prominent East End crime family. UK Edition.