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Thirty years ago, Strickland and a group of his associates, including Stephen Fisher, were involved in a covert operation on behalf of MI5. Now, someone is trying to kill all the members of that group and Strickland turns to the UCOS team for help.
UCOS re-open the investigation of a diplomat who drowned in the Thames just before Christmas 2008. Her eccentric twin sister believes that the Foreign Office is behind the death of her diplomat sister, making Pullman wonder if there might be some truth to Minnie's paranoia but Gerry is convinced there is another answermoreless
Jack announces that he he has decided to leave the team, but before Sandra, Brian and Gerry can question his reasons, Whitehall figure Stephen Fisher shows up with one of his secret cases featuring the unsolved murder of a woman dating back around a hundred years. With only 24 hours to solve it, the team attempt to find time to get to the bottom of Jack's surprising decision and attempt to persuade him not to leave.moreless
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 team are called in to reinvestigate the disappearance of PE teacher Jason Bowe after a body is found on the perimeter of the elite public boarding school where he was employed. The investigation has come at a really bad time for the school, which is getting to welcome a former pupil, the Rt Hon Geoffrey Parkes MP, for the opening of a new computer centre.
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, after DNA provides a link to the unknown man.
The UCOS team reinvestigates the murder of an unnamed vagrant strangled on a tube train 15 years ago when DNA tests on a suspect in a warehouse robbery reveal him to be the dead man's son.
When the conviction of a notorious crime boss, Edward Monroe, is questioned because a corrupt senior officer might have suppressed some evidence, UCOS is tasked to make a preliminary investigation. This case hits home for DCI Miller as she is certain that Monroe killed her CID partner eight years ago.
UCOS re-opens 17 year old missing person's case of a music student when a photo that features her is found in a charity shop donation bag. Sandra is convinced that it's a work of a serial killer. The team puts their efforts on identifying and finding all the other people on that photo. But when the pressure increases to hand over the investigation, Sanda starts to think about her future and turns to Jack to help make a decision.moreless
UCOS team re-investigates the murder of the young mother whose husband was convicted for her murder after he is released on appeal. Brian thinks his days at UCOS are over.
To keep his mind busy after his dismissal from the UCOS, Brian agrees to help one of Esther's friends to find her missing brother. At the same time UCOS team is trying to track down a conman who may be connected to several outstanding cases.
The team investigate the murder of an East German immigrant, but they only have his mysterious final words to work with. As they attempt to piece together his remarkable story, Sandra attempts to gain the trust of his estranged daughter.
The team is still in Rock of Gibraltar and are struggling to figure out what links murder of Christian Highsmith in 1998 to the murder of young local boy in 1982. After their return to London Brian Lane faces a disciplinary hearing for assaulting Commander Embleton at his retirement party.
UCOS team are tasked to re-investigate the five year old case of Simon Belgrade's disappearance when his blood-stained identity card is found in Epping Forest.
The investigation of the murder of Christopher Collins, who was listed on a website as missing by a former employer, meets a dead end until it is revealed that he was in the witness protection programme. Meanwhile, the team wonder what effect the upcoming cuts to the police force will have on UCOS.moreless
UCOS re-opens an old case of MP's researcher Ben Ransley's death when a dormant offshore bank account containing a lot of money is discovered in his name. He was killed on the evening of Labour's landslide victory and police found a photo of a beautiful blonde in his wallet. The woman was never identified. In the search of this woman Strickland introduces Sandra to a war crimes prosecutor who is very helpful to the case.moreless
New information links the unexplained death of a market trader to a series of drug rapes in east London - but with that case still ongoing, UCOS are unable to question the chief suspect, so they have to look into their victim's past in their search for clues. Gerry soon finds a likely culprit in the shape of the market inspector who clamped his car, while Sandra has problems of a more personal nature when her hated mother arrives for a visit.moreless
Retired DI Steve McAndrew from Glasgow joins the team to reopen one of his old cases when the DNA of a woman who went missing as a teen turns up at the scene of a petrol station robbery.
The weapon used to murder an Italian immigrant is found when an unexploded World War II bomb is unearthed on a West London allotment. UCOS re-opens 25 year old case and the ritualistic way of the killing leads then to one of the other gardeners when it's revealed he is a practising druid. DCI Sasha Miller arrives to replace Det Supt Sandra Pullman.moreless
As part of his initiation into a motorbike gang called The Braves, Reece Chapman plans to murder the rival gang member he believes killed his father Eddie, the former leader of The Braves. Desperate to stop Reece, his girlfriend Stephanie Parr turns to UCOS for help in solving Eddie's murder to prove he's targeting the wrong man.moreless
The UCOS team reopens a unsolved murder case of pornographer Jim Hockney when his daughter's paternity test reveals that he was not her father. They try to track down the previous suspect for the crime, the victim's girlfriend jazz singer Angela Gold. Recently retired police officer Dan Griffin joins the team as Brian's replacement.moreless
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 Gerry is convinced that the murder is related to Docherty's criminal connections, Brian is sure that the answer lies in his poetry.
The body of a missing computer expert turns up in a hospital morgue under a false name, so the team reopens the investigation into his disappearance. The dead man worked for the Metropolitan Police, giving him access to a great deal of sensitive information—added to which, he was in contact with a group of online hackers. As the seasoned detectives unravel the mystery, Brian struggles to accept Steve as the new UCOS member, forcing Esther to intervene.moreless
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.
A mysterious gun is found in the Thames which leads UCOS to an unsolved murder of a playboy shipping heir in 1998. Brian Lane gets suspended after he is accused of assaulting a fellow officer he thinks has cover up a death in custody which lead to his early retirement from the police force.moreless
McAndrew and Standing are sent to Scotland by Strickland for a week, to help the Glasgow Police try and establish a new UCOS section led by DCI Fiona MacDougall. While there, they end up being caught up in a cold case from 1993 featuring the murder of bookie James Soutar.