When British soldier Shaun Emery is accused of a crime he strenuously denies, newly promoted DI Rachel Carey is assigned to investigate.

After key evidence is mysteriously redacted from her investigation, Carey is forced to find other ways of pursuing Shaun, who is searching for answers of his own.

The stakes intensify for Shaun when he comes face to face with inscrutable CIA agent Frank Napier, whilst Carey's investigation appears to hit rock bottom.

Carey develops a theory as answers begin to reveal themselves, and Shaun finds himself trusting an enigmatic stranger who promises to lead him to the truth.

Neither Carey nor Shaun is prepared for what lies ahead, as the truth in all its complexity and ambiguity is revealed to them.

Carey teams up with Shaun Emery to try and expose Correction, but Napier is one step ahead. Shaun's future, and that of the nation's system of justice, lie with one person. Carey has a decision to make.