When soldier Shaun Emery's conviction for a murder in Afghanistan is overturned due to flawed evidence, he returns to life as a free man with his daughter. But Shaun's life takes a shocking turn and he must soon fight for his freedom once again.

After key evidence is mysteriously removed from her case, Carey is forced to find other ways of pursuing Shaun, who is busy searching for answers of his own to prove his innocence.

The stakes intensify for Shaun as he is interrogated by inscrutable US agent Frank Napier at a covert CIA outpost in a Belgravia safe house. While Napier is trying to discover Hannah's whereabouts, Carey is simultaneously attempting to locate Shaun.

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.

Surrounded by the architects of his downfall, the truth behind what happened to Shaun is revealed to him in precise detail. Meanwhile, Carey seeks for answers of her own.

Secrets of the intelligence services are in danger of being exposed. Shaun's future, and the fate of the criminal justice system, lie with one person. Carey has a choice to make.