In 2001 pathologist Bob Ruxton gave a verdict of accidental death on palaeontologist Bernard Fletcher, who died from a supposed fall at a dinner given by Mondial Oil Company in Bernard's museum. Now that verdict is declared unsound and the UCOS team reopen the case. Bernard supported ecology and disapproved of Mondial's work but, though married, he was a ladies' man having an affair with colleague Marie Braden. Marie's ex-boyfriend, Mark Slater quit the museum to set up as a trader in fossils, a lucrative business and it was alleged that Bernard sacked him for stealing exhibits. Mark would also seem to be the lover of Sarah, wife of James Winslow, Mondial's managing director. Bernard was certainly murdered but was the motive marital jealousy or greed? Jack is amazed when Bob Ruxton drops a bombshell. Written by don @ minifie-1

Following a warehouse robbery, Pete Offord's DNA is linked to that of an anonymous tramp who was murdered on a London Underground train 15 years earlier. Pete's snobbish aunt Janice, who cast his mother Iris out long ago, directs the team to Iris's 'unsuitable' lover in Essex, David Allenforth, a depressive who went missing just before the murder. David's brother Charles had hired a disreputable private eye McHugh to trace him but he drew a blank. No Ticket Tony, however, a terminally ill former associate of David's, did locate him and holds the key to the mystery, which is finally tied up by Jack's 'Columbo' act. Written by don @ minifie-1

DNA from an unidentified man killed in 1996 and staked to a cross is linked to pathology laboratory assistant Anna King, who explains that it must be her brother, David Celaj, fourteen years her senior, with whom she fled Albania as a little girl before Mr. and Mrs. King adopted her and he disappeared from her life. David was a police interpreter in the case of murder suspect and fellow Albanian Michael Luga, who walked free when a witness withdrew her statement. The team believe that Luga killed David but Brian's accidental discovery of the role of scarecrows in Albanian customs leads the investigation elsewhere whilst Gerry's adventures in French cuisine land him an unexpected dinner date. Written by don @ minifie-1

In 2009 market trader Kathy Green died after drinking drugged coffee. The UCOS team suspect but cannot prove a link with Anthony Gunnell, a man who raped women after doping them with coffee from his refreshment van. Through Helen, the nurse who looked after Kathy's senile mother in her last days, they learn that Kathy had an illegitimate daughter who was adopted and whose attempted reconciliation with her mother went badly. In solving the case Sandra recognizes parallels with her own unsatisfactory relationship with her visiting mother. Written by don @ minifie-1

Psychologist Samantha Gerson comes to UCOS to carry out a work study on older men. However she also wants the team to look into a suspicious hit and run from six years earlier, the victim being her brother Darren, a cycle courier. Darren suffered memory loss but now as his memory returns, he recalls that the package he was carrying was stolen and suspects foul play. His client - and lover - Claudia Scott, imported Moroccan furniture and Jack suspects a drug connection but Darren was also the founder of GLS, an anarchist group committed to ridding London of cars. When Darren is murdered the UCOS team have to find out how he funded GLS and who wanted him silenced. Written by don @ minifie-1

Sandra's old flame, Inspector James Larsen, asks the team to reopen the case of Mal Baxter, a supposedly respectable antique dealer apparently killed in a robbery. However James believes Baxter was an informant and a fence, killed by someone he had crossed. Whilst his family and ex-partner Tony Morgan refute such claims, other dealers are less generous in their opinions and keep bringing the team back to a job lot Baxter bought containing a valuable gold statue, which could have been the murder weapon. At an illegal night time auction, or Nazareth, where the statue is the principal lot, the team start to uncover the truth. Written by don @ minifie-1

In 2004 physics professor Philip MacKenna was apparently abducted from a Paris-bound train. His journey was last minute, after a colleague was robbed, and witnesses at the time proved to be using false identities, suggesting a plot to kidnap him for his expertise. Now his wife is getting cryptic emails, impossible to trace, suggesting he is alive, but she has been holding back a secret. A tip off from a Whitehall mandarin leads the team closer to the truth. Written by don @ minifie-1

Stephanie Parr tells the team that her biker boyfriend Reese Chapman, as a rite of passage, must kill a rival gang leader who supposedly murdered his father Eddie, founder of the violent criminal Braves biker gang when she is sure the killer was Marcus York, the club's current president. Superintendent Barlow asks the team to back off as he is surveying the Brave for drug-peddling but when Stephanie is attacked Sandra resolves to continue, despite a lack of witnesses for fear of York and Barlow's unhelpful attitude. David, Stephanie's father, holds the key but the identity of the killer does Barlow no good. Written by don @ minifie-1

A website highlighting unexplained disappearances alerts the team to the death of young mechanic Christopher Collins seven years earlier. Sandra discovers he was really called Tommy Barton, and was on a witness protection scheme having testified against drugs baron Derek Robinson. He was, though, a drug smuggler himself and was having an affair with his boss's wife. In tracing the killer the team is much aided by the hypnotherapist treating Brian's insomnia and they also learn that UCOS will not be terminated to save money. Written by don @ minifie-1

When keeper Zac Halsey's corpse was found in the tiger enclosure at Harefield Zoo in 2006, the assumption was that he had been mauled to death, but blood found during the refurbishment of his flat now suggests that he was murdered and his body dumped in the compound. He had recently been to Spain where the knife that killed him was purchased. An animal rights campaigner, sacked security guard and a couple with whom Zac enjoyed extreme sports, are all suspects and all seemed to have been in the zoo the night Zac died. Jack works out the killer's identity even though it means he and the team miss his presentation for bravery as a result. Written by don @ minifie-1