New series. The documentary that follows the work of Bedfordshire Police around the clock returns with new episodes that go behind the scenes of police investigations into major crimes. In an extended first edition, cameras follow the police as they hunt two separate stranger rapists, one who struck recently and another in a case from 10 years ago. In each instance, the attacker left a trace of DNA at the scene of the crime. Will new cutting-edge forensic techniques now help bring both rapists to justice?