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.

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

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.

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.

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.

When soldier Shaun Emery's conviction for a murder in Afghanistan is overturned because of flawed video evidence, he returns to life as a free man with his young daughter. But when damning CCTV footage from a night out in London comes to light, Shaun's life takes a shocking turn and he must soon fight for his freedom once again.

With newly promoted DI Rachel Carey drafted in to investigate Shaun's case, she quickly learns that the truth can sometimes be a matter of perspective. Should she trust Shaun Emery?