Based on the extraordinary true story of Alec Jeffreys' discovery of DNA fingerprinting and its first use by Detective Chief Superintendent David Baker in catching a double murderer.
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David Threlfall
DCS David Baker (2 episodes)
John Simm
Alec Jeffreys (2 episodes)
Anna Madeley
Sue Jeffreys (2 episodes)
Andrew Tiernan
DS Geoff Taylor (2 episodes)
Lorcan Cranitch
DI Alan Madden (2 episodes)
Dorothy Atkinson
Barbara Ashworth (2 episodes)
Neil Edmond
Robin Ashworth (2 episodes)
Hannah Walters
Kath Eastwood (2 episodes)
Ged Simmons
Eddie Eastwood (2 episodes)
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