Following Colin’s visit the police get involved – and the team receive shocking news. And, as the investigation draws to a close, a tantalising distant memory brings one more suspect into the frame...

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Presented by Colin Campbell and Suchin Mehrotra

Series written and produced by Satiyesh Manoharajah

Episode 9 producer: Jolyon Jenkins

Series audio production, sound design and original music: Steve Urquhart

Episode sound design and mix: Arlie Adlington

Executive producer: Alistair Jackson

Archive Producer: Helen Carr

Production Co-ordinator: Juliette Harvey

Production Manager: Elaina Boateng

Production Executive: Laura Jordan-Rowell

Creative Director: Georgia Moseley

Series Developed by Satiyesh Manoharajah and Colin Campbell

Editorial consultants: Jackie Malton and Shaun Keep

Legal Advisors: Sarah McColl and Andrew Downey

Editorial Policy Advisors: Matthew Eltringham and Kim Barrington

Archive from BBC Archive and Fremantle

Artwork: Victoria Ford

Voice actor: Paula Goldstein

Solo Violin performed by Esme Bryden

Additional research: Christian Dametto and Bushra Siddiq

A BBC Studios Production