A year has passed since Rob Simpson-Stone received a photo of his nieces enjoying a night out, unaware their photographer was one Anders Folden: a psychopathic hitman Rob helped to put away while working undercover for the Met Police Special Investigations Unit.

Only Gray Fisher—Rob's former boss, now his business partner—is taking Rob seriously. The powers-that-be insist Rob and Gray are being paranoid: there's no proof the photo came from Folden, who's stayed off the authorities' radar long enough to have assumed a new identity and fled overseas. It takes a significant threat to Rob's son's life for anyone to question that assertion, but police protection is worth nothing when the target has friends in high places to bend and break the law to his will.

Folden won't stop until he's completed his mission: to fulfil a contract or end a personal vendetta, Rob and Gray are no longer sure which. What they do know is they need to find him before he finds them—with or without help from the authorities.