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.
David Threlfall
DCS David Baker
John Simm
Alec Jeffreys
Anna Madeley
Sue Jeffreys
Andrew Tiernan
DS Geoff Taylor
Lorcan Cranitch
DI Alan Madden
Dorothy Atkinson
Barbara Ashworth
Neil Edmond
Robin Ashworth
Hannah Walters
Kath Eastwood
