Age is catching with Robert Finlay, a police officer on the Royalty Protection team based in London. He's looking forward to returning to uniform policing and a less stressful life with his new family. But fate has other plans. Finlay's deeply traumatic, carefully conceled past is about to return to haunt him. A policeman is killed by a bomb blast, and a second is gunned down is his own driveway. It becomes increasingly clear to his friends and family that Finlay is not the man they think he is. And so begins a sadistic game of cat and mouse with a determined and unknown enemy.