When the team investigate the death of an MP's researcher and find themselves in hot pursuit of a mysterious Bosnian woman, Strickland introduces Pullman to a war crimes prosecutor who proves to be more than helpful to their case.

The team investigate the unsolved killing of brilliant young doctor Lydia Dryden in a case that takes them into the two very different worlds of public and private medicine.

Danny Griffin is bereft when daughter Holly leaves home to start university, so his UCOS colleagues throw some fun distractions his way. And he might even be about to acquire a pet...

While investigating the murder of 55 year-old interpreter Agnes Bradley, the UCOS team get a partial DNA match from a teenage boy who once threw a brick onto a motorway as a dare. They interview the boy to see if one of his male relations could be the murderer, only to discover that his mother was raped and they could be looking for a rapist-turned-murderer. Agnes was a chess enthusiast so Gerry Standing and Steve McAndrew interview members of her local club while Sasha Miller and Strickland investigate leads from Agnes’s working life, where they meet a Chilean diplomat with a possible axe to grind. Steve McAndrew’s elderly father is dying, so he brings him to a London hospice for his last days.