Please note this is a region 2 DVD & will require a region 2 (Europe) or region Free DVD Player in order to play From the Director of Broadchurch & the producer of Line of Duty comes Code of a Killer The gritty telling of the extraordinary true story of Alec Jeffreys discovery of DNA fingerprinting & its first use by Detective Chief Superintendent David Baker in catching a double murderer David Threlfall (Shameless) takes the role of David Baker who between 1983 & 1987 headed up the investigation into the brutal murders of two Leicestershire schoolgirls Lynda Mann & Dawn Ashworth Only a few miles away Dr Alec Jeffreys played by John Simm (Prey) was a scientist at Leicester University who on 10 September 1984 invented a remarkable technique to read each individual&s unique DNA fingerprint