Some things are better left forgotten.... Detective Sergeant Mackenzie Stone's wife Lucia disappeared without a trace three months ago. Now on compassionate leave Stone uses every waking hour to try to find her. In a story brimming with twists and turns Stone investigates an unsolved murder and finds his personal life inextricably linked to that of the murderer. Jemma Redgrave co-stars in this programme which delves into the darkest part of a man's mind and leaves Stone fighting