With Sasha back on fighting form, UCOS investigate the passing of a talented cricket prodigy: star of the pitch and apple of his father's eye - yet loathed by his teammates. The passing was recorded as misadventure, but with new evidence pointing to infighting, overzealous autograph hunters and extramarital affairs, UCOS are soon bowled over by the list of potential cuddle suspects.
Wise to Steve's monetary problems, Danny appoints himself as personal financial advisor and enforces a strict no-frills, no-fun budget. But even with this distraction, he can't escape his own worries about revealing his relationship with Fiona to his ex-wife. Sasha cracks down on the boys' lacklustre fitness and reluctance to come to the 'cursed' Mum and Dad's Do.
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.