New Tricks

Jack Halford deals a devastating blow to UCOS, he's quitting, but before the team - Detective Superintendent Sandra Pullman, Brian Lane and Gerry Standing - can question the reasons behind his decision and persuade him to stay, shadowy Whitehall Intelligence figure Stephen Fisher arrives with one of his secret cases, the unsolved murder of a woman dating back 100 years, giving them just 24 hours to solve it.

The UCOS team reinvestigate the disappearance of a PE teacher when the remains of a body are discovered on the perimeter of the elite public boarding school where he used to teach.

When UCOS reinvestigate the suspected suicide of a young diplomat, DS Sandra Pullman breaks the rules in order to explore a possible cover-up at the Foreign Office.

The UCOS team's feathers are ruffled when Steve McAndrew, a retired detective from Glasgow, descends on the office like a bundle of Scottish energy. Brought in to reinvestigate one of his original cases - the disappearance of teenager Georgia Wright - McAndrew's policing methods raise a few eyebrows. He has a few tricks up his sleeve that make Brian and Gerry look like slaves to the rule book.

When the body of missing computer expert Martin Longthorn turns up in the morgue of a teaching hospital under a false name and address, the UCOS team find themselves drawn into the unfamiliar world of online hacktivists. Martin worked for the Metropolitan Police and his disappearance caused concern at the time. Why was his body hidden - and by whom?

UCOS investigate the case of 16-year-old tennis champion Alice Kemp, who fell to her death from the balcony of a penthouse flat after losing a crucial match. As the team delve into this competitive world, Standing wonders if he did enough to encourage his own daughter's sporting ambitions.