Ministry of Defense spooks try to silence the UCOS team when they reinvestigate the death of British soldier Eric Trimble. Just weeks before a tour of duty in Iraq, Trimble -- along with three other soldiers -- was sent to the MoD's Influenza Research Unit to take part in a medical trial. All four played hooky one night, but Trimble never returned. He was found beaten to death two miles from the Unit. Was Trimble the victim of a racist attack, an army cover-up, or was his death a direct result of the experiments being carried out by the IRU?
A motley crew of retired police officers re-opens troublesome cases that were never laid to rest.