Twenty years ago, Malcolm Whiteley discovers his wife Lysette is having an affair. The Whiteleys are wealthy and live with their 16-year-old daughter Amber in the magnificent Dungeon House, overlooking Cumbria's western coast. But Malcolm begins to disintegrate psychologically, and when Lysette tells him their marriage is over, he snaps, and takes out the old Winchester rifle he has been hiding . . . In the present day, Hannah Scarlett's cold case team are looking into the three-year-old mystery of the disappearance of Lily Elstone, whose father was Malcolm Whiteley's accountant. Their investigation coincides with the disappearance of another teenage girl, Shona Whiteley, daughter of Malcolm's nephew Nigel. Twenty years earlier, Malcolm shot his wife and apparently killed his daughter before shooting himself. But as Hannah's team dig down into the past, doubts arise about what exactly happened at the Dungeon House . . .
