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 for his own innocence, wondering if he murdered his wife and if he himself is suffering from amnesia...