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
