January, 1981.

Jim Dowd is a British Special Forces soldier, highly-trained and loyal. With his colleague, army intelligence officer, Maureen O'Brien, he enters a bitterly divided Belfast with a mission- to go undercover with new identities, infiltrate one of the city's most dangerous Catholic communities, and help change the course of a war that nobody is winning.

The Ardoyne is a perilous world, cut off from the law and run by dangerous men, where even a hint of Jim's and Maureen's true identities will prove fatal. But it is also full of pride, courage and loyalty, and Jim realises he admires this community - and as relationships form, his guilt at his deception grows ever stronger.

When they receive shocking orders, Maureen knows they must act swiftly and ruthlessly, but can she rely on Jim? And if they rebel, are they betraying their country, or are they being betrayed?