Cold Case Investigators: Solving Britains Sex Crimes 1x2 (BBC)

Across the UK, there are hundreds of thousands of unsolved sexual offences lying dormant in police archives. Some go back decades. One remarkable police unit is trying to change that by harnessing the power of modern DNA techniques. Can they catch a rapist who has gone unpunished for nearly 30 years? And have they caught the man who kidnapped and sexually assaulted two schoolgirls in 2002?