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Ministry of Defence spooks try to silence the UCOS team when they reinvestigate the death of British soldier Eric Trimble, in the final episode of the crime drama. Just weeks before a tour of duty in Iraq, Trimble, along with three other squaddies - Andy Merrill, Keith Sharratt and Ronnie Glazebrook - was sent to the MoD's Influenza Research Unit (IRU) to take part in a medical trial.

All four did a bunk one night, but Trimble never returned. He was later found beaten to death two miles from the Unit. Was Trimble the victim of a racist attack or an Army cover-up, or was his death a direct result of the experiments being carried out by the IRU? When the MoD's DI Hamilton tries to stifle the case and the Army becomes obstructive, Jack Halford and DAC Strickland form an unlikely bond that sees them breaking protocol to get answers.

With the three surviving soldiers now suffering from either serious psychological, drink or memory problems, the team hopes that the Unit's Dr Matheson can shed light on the true nature of the trials. Brian's behaviour, meanwhile, causes concern. He appears to have improved since being fooled into thinking he can drink just one glass of wine, however, his alarming new obsession is masking the truth.