A young woman insists that the suspicious death of a local librarian was because of witchcraft and the team are drawn into the world of magic and the supernatural. A series of strange events occur and they are put under increasing pressure. The squad gets convinced that the supernatural exist and struggle to remain cynical.

The team looks into the death of a terrorist 30 years previously after his daughter receives an anonymous note claiming he was murdered - an investigation that takes them right back to the Greenham Common anti-nuclear protests. Meanwhile, Sasha agrees to go for dinner with her ex-husband Ned, which he is hoping will lead to a reconciliation.

Ted Case is welcomed by Danny and Steve into the UCOS office in Sasha's absence, but for all his wealth of experience, they aren't sold on his superstitious quirks. The team take a look at the case of a brutally murdered vicar who received racist hate mail in the lead up to his murder.

The team investigate the art of illusion when they reopen a case involving a magic trick that ended in murder. Powerful mind games and hypnosis prove a dangerous mix for Brian Lane, however, sending him down a destructive path. Meanwhile, a session with the Magic Circle's Dr Moroni leaves a sceptical Gerry Standing feeling paranoid and his colleagues a little nervous around him.

A young woman's paternity test leads to the reopening of a notorious murder case from the seedy underworld of 1980s Soho in which the prime suspect was mysterious ex-jazz chanteuse Angela Gold. Meanwhile in UCOS, feathers are ruffled when recently retired police officer Dan Griffin joins the team.

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...

The boys' investigations take them to a lookalike agency whose top acts were found dead.

The discovery of a fake painting in the Queen's art collection sends the UCOS team on a hush-hush mission to uncover the forger. Their investigations swiftly uncover a trail of high class frauds and suspicious deaths, but also lead to suspension for one of the squad. NOTE: In Scotland This Episode Was Shown On Sunday 11th April Due To LIVE Sportscene Football Being Shown

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.

UCOS re-open the case of Sean Docherty, a talented young poet whose burnt body was discovered ten years ago in the scrapyard of a known gangster. While Standing is convinced that the murder is related to Docherty's criminal connections, Lane is sure that the answer lies in his poetry.

Family ties affect both Gerry Standing and Sasha Miller. While Sasha is forced to work with ex-husband Ned as he fills in for Strickland, Gerry returns to his roots in Bermondsey to help arrange his daughter's wedding. As a consequence he is thrown into a case involving the possible murder of an architecture student who is also the grandson of an old friend. Meanwhile, Danny Griffin has been on an FBI course in reading body language.

The team investigate the death of a personal trainer who had belonged to a Roman reenactment society and discover a gang selling illegal steroids, but the motive for murder may not be all it seems. And Danny Griffin starts to become attracted to his forensic pathologist colleague Fiona Kennedy just as he receives some troubling news about his wife.

UCOS want to talk to a Turkish girl who is found working illegally in Dalston, regarding a unsolved murder from 2009. The landlord of a pub, Richard Gibson, died in a fire and the case had remained unresolved. The team meet the landlady of the pub, Joanna Gibson, who is also Richard's widow. His best friend, David is also someone of interest, especially when the team find out the French champagne he is selling, is actually sparkling wine produced in Britain. Sasha enters the team into a 5-a-side football competition.

Ted leads an investigation into the apparent suicide of a city trader in the 80s.

With Sasha back on fighting form, UCOS investigate the death of a cricket prodigy.

When a missing person case which Lane originally investigated gets re-activated, he's determined to crack it. But when the team swiftly uncover another two mysterious disappearances, they start to think they've got a serial killer on their hands.

Lane indulges his obsession with fishing when UCOS investigates the case of two boys abducted from a fishing lake in 1979, believing it could be linked to a recent spate of snatches near the M25.

New series of the drama featuring an eccentric group of ex-police officers brought out of retirement to investigate unsolved crimes. Jack confronts his nemesis in court when Ricky Hanson stands trial for his attempted murder, and Gerry faces the consequences of lying to his 'daughter', Emily. The team uncover a shady organ-donor racket when they reinvestigate the murder of a wealthy businessman who left a three million pound fortune to a prostitute.

The team return to the 1992 case of actor Michael Austin, shot dead by his wife on stage during the opening night performance of Death at the Masked Ball. Already a man down when Halford goes AWOL, the case looks like claiming another member of the team as Lane embraces his newfound love of acting and the theatre.

The team reinvestigates the murder of a popular DJ who died live on air after an arson attack at 80s music station Roxy Radio. Lane is determined to find the missing Jack Halford when Pullman and Standing threaten to quit rather than work with a new team member.

The team find themselves at the centre of a shocking cover-up.

UCOS are forced to re-open the investigation into producer Max Stone's death.

When a retrospective exhibition of murdered fashion designer Ritchie Levene's work opens, the team is prompted to re-examine the three-year-old crime. The detectives learn about his tempestuous relationships with his new spouse, personal assistant and ex-wife Sarah, who believes his brother Adrian is the killer because he had the most to gain from his death. Meanwhile, Gerry enlists Emily to help update his image, although not everyone is impressed with the results.

When 18-year-old debutante Barbara Linden-Warner disappeared without trace 27 years ago, the assumption at the time was that she had been kidnapped and her father, a wealthy British arms manufacturer, paid a ransom for her return. When new evidence emerges about her last movements, the indication is that she may still be alive.

The UCOS team are drawn into a world of immigration loopholes, Albanian gangs and family feuds when they reinvestigate the death of an unidentified male discovered on farmland outside Waltham Forest in 1996, in what appeared to be a crucifixion.