Detective Superintendent Sandra Pullman and her unconventional team of ex detectives – Jack Halford, Brian Lane and Gerry Standing – reinvestigate more unsolved murders and cold cases with their characteristic conflicts over procedure and rules.
They may have the experience but it's not like the old days. Not only are they chasing criminals, but they are having to deal with a new police force which does not always appreciate their old style policing.
The death of a boxer, the murder of a celebrated graffiti artist, the stabbing of a fashion designer and the suspicious suicide of a college professor, are just some of the crimes that are solved in Season 7.
As usual, there are plot twists and red herrings galore, plus a number of suspects are played by well-known guest stars.
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.
The series is produced by Wall to Wall.