Gerry Standing's youngest daughter is about to marry a solicitor and she becomes upset after hr father interrogates Robin about his credentials. Sasha Miller is forced to work with her ex-husband, Ned Hancock whilst Gerry receives a visit from an old friend from the past, Ralph Paxton, who has just just been released prison. He wants Gerry to help him solve the cuddle of his youngest grandson an architecture student called Jake.
New Tricks follows the work of the Metropolitan Police Service's Unsolved Crime and Open Case Squad (UCOS). Led by Detective Superintendent Sandra Pullman, it is made up of retired police officers who have been recruited to reinvestigate unsolved crimes.
The series title is taken from the popular expression "You can't teach an old dog new tricks". The "old dogs" are successful in adapting their skills and experience to modern policing, with their knowledge of past cases proving especially useful.