London detectives investigate crimes from the past, unravelling secrets left buried for years.
Cast:Sanjeev Bhaskar , Jordan Long , Carolina Main , Nicola Walker , Lewis Reeves , Peter Egan , Hiten Patel , Pippa Nixon , Jassa Ahluwalia , Michelle Bonnard , Georgia Mackenzie , Alastair Mackenzie , Colin R. Campbell , Sinéad Keenan , Ian McElhinney , Trevor Eve , Alex Jennings , Phaldut Sharma
Cassie and Sunny join together to investigate when a body is found in a suitcase when the river Lea gets dredged.
With their victim now identified, Cassie and Sunny's search for David Walker's killer is underway.
Jason finds it difficult to process his father's death and asks Cassie to see his dad's body following his outburst at stepsister Becca.
With Sara's revelation about her past to her husband sending shock waves through their domestic bliss, she fights to make him understand.
Cassie turns her attention to investigating the goings-on at the Brentford house and the theory that one or more of the suspects may have been abused at the gatherings that took place there.
With each of the suspects having a motive, opportunity or connection to David Walker, Cassie and Sunny try to join the dots to discover who actually killed him 25 years earlier.