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
as DCS David Baker
John Simm
as Alec Jeffreys
Anna Madeley
as Sue Jeffreys
Andrew Tiernan
as DS Geoff Taylor
Lorcan Cranitch
as DI Alan Madden
Dorothy Atkinson
as Barbara Ashworth
Neil Edmond
as Robin Ashworth
Hannah Walters
as Kath Eastwood
Ged Simmons
as Eddie Eastwood
Lydia Rose Bewley
as Vicky Wilson
Jaz Deol
as DC Taran Kholi
Adam Nagaitis
as Ian Whenby
