Series Six follows the antics of three retired police officers under the command of Superintendent Sandra Pullman, as they reinvestigate unsolved murders. Brian enters The Trinity Clinic for treatment of his alcohol addiction, unearthing a new case in the process. The team also investigate a military cover-up, enter the not-so-glamorous world of films and look into the reappearance of a dead woman. Hanson rears his violent head once again and many family secrets are uncovered in the meat market at Smithfield's. UCOS's track record and reputation precede them, attracting cases from outside their jurisdiction. However, they still insist on rejecting modern policing methods, proving the old ways are the best.
