London police detectives Cassie Stuart and Sunny Khan investigate historic cold cases involving missing persons, murder and long-hidden secrets.
When a skeleton is unearthed, a car key found near the body is the only clue to the identity of the victim.
DCI Cassie Stuart begins to identify the people mentioned in the diary of Jimmy Sullivan.
As the investigation in to Jimmy's death continues, Cassie and Sunny visit Father Robert Greaves hoping to identify the mysterious Jo-Jo.
The investigation into Jimmy's death continues, as Cassie and Sunny question Sir Phillip Cross.
As the investigation into Jimmy's death continues, Sir Phillip Cross makes a difficult decision while Father Robert comes clean to his family and the police.
As the investigation into Jimmy's death concludes, Father Robert finds that revealing the truth has lasting repercussions and Maureen lays her son Jimmy to rest.
