After pathologist Bob Ruxton is suspended from his job on the grounds of negligence, the UCOS end up being forced to reopen one of his old cases. Dr Bernard Fletcher, who worked as a senior palaeontologist at the Natural History Museum, was discovered dead following a business event in the Central Hall. His autopsy had stated that his passing was the result of a fall.

After Peter Offord is arrested to do with with a warehouse robbery, DNA tests end up proving his innocence but link him to an vagrant who was strangled on a tube train 15 years ago. The UCOS decide to reopen the case.

The team find themselves becoming involved into a world of immigration loopholes, Albanian gangs and family feuds after they end up reinvestigating the passing of an unknown man discovered on farmland back in 1996.

The team find themselves reinvestigating a really sensitive case,after new information come to light which links the unexplained passing of popular market trader Kathy Green, to a series of drug rapes that have occurred in East London.

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.

Some old memories and feelings return to the surface after Sandra Pullman is reunited with an old flame. DCI Larson wants Sandra and her team to reinvestigate the cuddle of antiques dealer Mal Baxter. Mal was discovered dead in his home, having been struck over the head in what was originally thought to be a burglary that went wrong.

The team find themselves reinvestigating the disappearance of a prominent scientist after his wife receives a number of anonymous emails from somebody who claims to know the truth about what really happened to him. When the team investifate further DAC Strickland is warned off the case by Whitehall figure Stephen Fisher.

The team end up reinvestigating the cuddle of Eddie Chapman who was in charge of a notorious criminal motorbike gang called The Braves, after some new evidence is brought to them from an unexpected source.

The team end up reinvestigating the cuddle of an identified male found in a West London alleyway seven years ago after the victim is named on a website which highlights different unexplained disappearances. Christopher Collins, is named as the victim by Lisa Carlisle, who's husband had employed Christopher as a mechanic six months before his passing.

The team re investigate the case of zoo keeper called Zac Halsey, who was mauled to passing in the tiger at Harefield Zoo in 2006. It was ruled as a tragic accident but blood discovered in Zac's lodgings during a recent refurbishment at the zoo make it look like he washuged before being discovered in the enclosure.