New Tricks is a British television procedural drama, first broadcast in 2003. In February 2015, BBC One announced the show would end after series 12. The show's title is taken from the proverb "You can't teach an old dog new tricks".
The series follows the work of the fictional Unsolved Crime and Open Case Squad (UCOS) of the Metropolitan Police Service, a squad of retired police officers recruited to reinvestigate unsolved crimes. There have been cast changes, but the squad always consists of three men with a female boss.