An unexpected encounter with his estranged sister and Clark Radcliffe discovers her idyllic London life may not be all it seems. Driven by desire for reconciliation he offers to help in any way he can. Gradually he is drawn into a dangerous and complex investigation involving his colleagues in Belfast, the police and a renegade organisation of London city analysts. As Clark unearths a spiral of secrets and lies he learns it is his family who have most to lose. Are the bonds strong enough to survive?