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.

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.

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

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.

UCOS reinvestigate the death of a wealthy financier when a psychic tells the dead man's daughter that she needs to resolve some unfinished business on her father's behalf. Deeply sceptical of Sebastian Carter's 'gift', the team set out to prove him a fraud, but Pullman struggles to dismiss him as a con man when he reveals a conflict involving her own late father.

Brian finds the library card of cold case victim Dr Richard Symes, leading him to reinvestigate the death of the professor, who died after falling from the roof of his college three years previously. Sandra and Gerry interview Symes' widow, who believes principal Jeremy Ventham drove her husband to suicide following a conflict over teaching methods.

After being released from jail, notorious paedophile John Davies admits to the abduction and murder of a child 25 years previously. Suspicious of his motives, the detectives reopen the unsolved case in an unusual attempt to prove his innocence, reinvestigating the boy's disappearance while on a demonstration with his left-wing activist parents. Guest starring Adrian Schiller (Being Human) and Samantha Bond (Outnumbered)

A recent rape is linked to two similar attacks at a chocolate factory 10 years previously, leaving the team no choice but to reopen all three cases. The detectives uncover news of an unhappy workforce, learning of an alleged suicide, and their investigation becomes even more complicated when they discover a severed finger was found in one of the company's snacks. After a visit to the doctor, Gerry decides to quit smoking, and instead of resorting to nicotine patches or gum, he enlists Sandra to help him quit

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.

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 the gun used to murder a talented young boxer 11 years ago surfaces in an armed robbery, UCOS are drawn into the darker side of professional boxing in a case that causes conflict and friction among the team.

The team reinvestigate a 30-year-old safety deposit robbery, and they soon find themselves being drawn into a case involving police corruption that threatens the future of the UCOS itself.

The OAP detectives return to investigate a fresh batch of unsolved crimes, beginning with the murder of a palaeontologist at the Natural History Museum. After a bit of digging, the team discover the victim was a respected but outspoken scientist with a knack for rubbing people up the wrong way - and when they discover he was strongly opposed to the museum's sponsorship deal with a large fuel company, the old dogs soon have plenty of suspects.

Amanda Redman stars, with guest appearances from the late Trevor Bannister (Are You Being Served?), Lucy Brown (Primeval) and Natasha Little (Spooks)

After psychologist Samantha Gerson shows up at UCOS to conduct a study on older men in the workplace, she ends up getting a mixed reception. Samantha also wants a favour and asks Pullman to look at her brother's case. Darren Gerson was the victim of a hit and run in May 2006 which left him with a serious brain injury and complete memory loss of anything about his life before the accident happened. Darren now is convinced that he is still a target because of the package he was carrying at the time.

Sandra's old flame DCI Larson, head of the Met's arts and antiques squad, asks the team to reinvestigate the murder of antiques dealer Mal Baxter. His death was originally thought to be the result of a burglary gone wrong, but new evidence suggests Baxter was a police informant while conducting underhanded deals.

The team reopen the case of zookeeper Zac Halsey, originally thought to have been mauled to death by a tiger, when blood evidence discovered in his lodgings suggests he was killed before he was found in the tiger's enclosure.