DCI Cassie Stuart and DS Sunny Khan investigate when a skeleton is found in the cellar of a derelict house. The discovery of 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 in the cellar as Jimmy Sullivan, the hunt for his murderer begins. Cassie and Sunny begin by following up on the names written in Jimmy's diary. 'Frankie C' is identified as Sir Phillip Cross -- a government czar. 'Beth' is Lizzie Wilton, who also denies knowing Jimmy, but it is clear she was a very different woman in the 70s, before her current marriage. UK Edition.

Cassie and Sunny visit a priest who remembers Jimmy fondly, but unfortunately Father Robert Greaves is unable to identify 'Jo-Jo', the mysterious person who gave Jimmy the diary. The investigation also leads to another person who remembers Jimmy well -- Eric Slater, who used to be a bookkeeper at Arlingham House, a hostel where Jimmy had once lived. UK Edition.

The investigation into Jimmy's death continues, with the discovery of marks on his body consistent with known gangland torture methods. Cassie and Sunny question Sir Phillip to find out exactly what his involvement was with a prominent East End crime family and Eric and Claire's anniversary party gets underway. UK Edition.

Sir Phillip Cross makes a difficult decision in order to protect his family and salvage what is left of his reputation. Ray returns home to find Lizzie gone and a note that reads "I'm sorry" and Father Robert comes clean to his family and the police. UK Edition.

Father Robert's revelations have lasting repercussions. Things are especially difficult when Caroline goes into premature labor. Bella and Josh deliberate over how best to deal with their father and the search for Lizzie continues. Maureen is finally able to lay Jimmy to rest. UK Edition.