DCI Cassie Stuart and DS Sunil Khan look into a cold case when a skeleton is located in the foundations of a demolished building.

Having identified the body, Cassie and Sunny begin investigating the names mentioned in Jimmy Sullivan's diary. This includes a well-known public figure, who denied any relations with the homeless boy.

Cassie and Sunny pay a visit to a priest with a connection to Jimmy, but when he proves to be less helpful than they'd like, they move on to Arlingham House's former bookkeeper.

Sir Phillip Cross is questioned by Cassie and Sunny concerning his ties to an East End crime family; an anniversary party is held for Eric and Claire.

Cassie and Sunny continue to look into Jimmy's death; Sir Phillip Cross attempts to preserve his reputation and protect his family; Father Robert confesses to his family and the police.

Father Robert learns first hand that revealing the truth has lasting repercussions; Caroline goes into labour early; Bella and Josh are unsure how to deal with their father.