Episode 9: The Man in the Tower

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