New Tricks: Season 12

Gerry is personally involved when the body of Martin Ackroyd, his first inspector when he joined CID, is discovered having been missing for thirty years. Prime suspects are former officers Bryant and McCabe, whom Ackroyd believed to be corrupt and are now involved with career criminal Dominic Chapman, as is Ackroyd's ex-superior Ronald Sainsbury who colludes with them to discredit Gerry. Gerry tracks down Tommy Naylor, another crook the dead man had in his sights and whom Bryant and McCabe unsuccessfully attempted to frame. Gerry decides to take the law into his own hands after his daughter Caitlin is threatened but this only makes him seem guilty of the murder in Sasha's eyes.

With evidence suggesting that his cosh was the murder weapon and a trumped-up assault claim from Sainsbury things look bleak for Gerry but DAC Strickland is sure of his innocence and lets him go. With dangerous men in pursuit Gerry goes on the run with Danny, to whom he relates that Ackroyd was as corrupt as any of the other suspects and was in Chapman's pay. They call on Tommy Naylor, who directs them towards honest Ted Case, another retired officer and he gives them evidence of Ackroyd's involvement with Chapman. This in turn leads Gerry back to Bryant and McCabe and arrests are made, followed by recrimination, chicanery, a funeral and a departure.

Vicar, Leonard Whitechurch, was found by his 10 year old son, Luke, stabbed to death in the vicarage. 9 years later the murder weapon has been discovered, and Luke now claims to remember an argument and seeing the killer run away.

1989, stock trader Charlie Hayes was found dead after falling from the roof of his office building, after loosing a fortune; it was assumed he jumped. However a photograph has been discovered that shows Charlie was pushed.

In 2005 AJ Da Silva, an England cricketer in the prime of life, was found dead in his bath. Now the autopsy finding have come into question, and AJ's father, who always said his son was murdered, is looking for answers.

13 years ago, celebrity lookalikes Anna and Jim Briggs were found dead in an apparent double suicide. But now Anna's second phone has been found, and she was having an affair, which makes double suicide with her husband very unlikely.

In 2011 Private Detective Dave Hooper was stabbed to death in his office, police suspected a robbery gone wrong, but with no evidence the case stalled. Now police have one of Hoopers notebooks, and an anonymous request for justice.

Fiona joins the team to work on the case of Lottery winner Cheryl Sheekey, who disappeared in 1998, and whose body has just been discovered in her own back garden. But there is no obvious cause of death, and very little new evidence.

A blood-stained bust uncovered in a graveyard links to the 2008 murder of alternative health practitioner Jason Henway. Angela Morris blamed him for taking her late mother Gwen off chemotherapy but had an alibi. Jason's business partner Evan Langley stood to gain but points the team towards Jason's brother Douglas, a doctor practising cryopreservation, keeping the clinically dead alive through low temperatures, since he left the business having quarrelled with his brother on his wife's death. As well as solving the murder the team must also deal with Sasha's departure when she is offered an appetizing promotion.

One the eve of the Millennium, mental health reform activist, Greg Collins, was stabbed to death. With no evidence or witnesses police were stumped, but Greg's daughter has found a diary where he wrote about someone wanting to silence him.