Michelle Ackerley is in Leicester, where she meets leading forensic scientists who are investigating historical mysteries and modern-day cases. Back in the studio, former police detective Rav Wilding marks the 35th anniversary of Neighbourhood Watch and warns viewers of the latest scam affecting people with disabilities who need specialist assistance dogs.

This episode follows the detectives using science to solve crime - including officers from Staffordshire who used cutting-edge techniques to reveal the face of an unidentified body which has remained a mystery for nearly half a century.