A dynamic high-flying city lawyer, Bryony Willis, receives a note to say that her terrorist father was not accidentally killed by his own bomb in 1982 but was actually murdered by the police. The UCOS team interviews Bryony's mother, who raised her on Greenham Common, and stumbles upon a dangerous, high-powered police cover-up. Sasha's ex-husband Ned tries to win her back. Is she tempted? Or has too much water passed under the bridge?

The episode was rated 7.54 from 59 votes.

When a camera and film belonging to a photographic lab assistant murdered in 1987 are found in a Soho pub toilet, the team reopen a 20-year-old case. Elsewhere, Gerry is less than happy when his daughter Emily joins the team and looks to Sandra as a role model.

The episode was rated 7.54 from 59 votes.

When graffiti appears around London by an unknown person claiming to have murdered a celebrated street artist, the team reopens the four-year-old case. Originally part of a gang, the victim went solo when he received support from a wealthy art patron, leaving the detectives suspicious of his resentful former crew members. Meanwhile, Brian signs up to Twitter to chart the gritty life of a lawman, much to his colleagues' displeasure.

The episode was rated 7.52 from 52 votes.

The team investigate the death of the Chief Brewer at Felspar's Brewery which proves to be rather intoxicating for the boys. For Pullman, the case has a more personal agenda and she learns some difficult truths about her dead father.

The episode was rated 7.51 from 45 votes.

As the series comes to an end, the desiccated, neatly carved-up body of a butcher who disappeared more than 30 years ago is discovered, leading Sandra Pullman and her boys to pay a visit to Smithfield meat market in London, the original murder scene. It's a pity the butcher is dead, because he has a few questions to answer about why the body of a doctor was found hanging from a meat hook all those years ago at the back of his market stall. It's an episode peppered with revelations. We discover Gerry Standing's very interesting family history - he's descended from French Huguenots and is thus tormented by his colleagues for being a fake cockney, much to his annoyance: "Je suis ang-bleedingglais!" he protests. But it's Sandra who has to face up to a startling personal disclosure that has a direct bearing on the case and also throws a whole new light on her father. For once Gerry, Brian and Jack are left completely speechless.

The episode was rated 7.51 from 55 votes.

Jack and Strickland form an unlikely alliance that sees them break the rules to find out why a British soldier died while taking part in a Ministry of Defence medical trial. With three of the man's colleagues now suffering from psychological, drink or memory problems, the team consider whether he died as a result of the experiment, or if he was a victim of an Army cover-up.

The episode was rated 7.46 from 48 votes.

The murky death of Joe Walsh, General Secretary of the Crane Driver's Union, whose body was found in the Thames in 1975, is reinvestigated. At the time of his death, Walsh stood accused of stealing money from the union's account. The team find themselves at the centre of a political minefield, with suggestions of misappropriated union funds, MI5 involvement and a union leader whose threats of strike action were gravely threatening the national interest.

The episode was rated 7.45 from 67 votes.

The UCOS team find themselves reinvestigating the death of a well-known timeshare magnate.

The episode was rated 7.39 from 51 votes.

In an attempt to make contact with his late wife Mary, Jack goes to see a clairvoyant. Instead he meets a girl who died in a shipping container in 1982 and has the case re-opened.

The episode was rated 7.37 from 78 votes.

The team exhumes the body of a car crash victim after claims she has been seen alive.

The episode was rated 7.15 from 52 votes.