Nicola Walker (Last Tango in Halifax) and Sanjeev Bhaskar (Indian Summers) star as police officers investigating the cold case murder of a boy whose diary implicates four seemingly unconnected couples in a thriller that The Guardian (UK) hailed as “so much more than a satisfying murder mystery.”

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The team travel to Middenham to meet Hayley’s family.

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Cassie and Sunny work to identify human remains found buried near a London motorway.