The narrator has been married to her kind, loving husband Lachlan for more than twenty years, secure in the life they have built together. Then her best friend says something that makes her doubt everything, pointing out how strange it is that Lachlan has lived close to two unsolved murders, first the killing of a woman in the small Scottish village where he grew up, and more recently the shocking death of a woman who lived just around the corner from them. Unable to silence the suspicion, the narrator travels to Scotland determined to make her husband confront his past. But as secrets begin to unravel in the remote Scottish Highlands, she discovers the truth is far more complicated than she imagined, and that more than one person could be a killer. With her children beside her, she realises they may all be in terrible danger, and that coming here could be the last mistake she ever makes. A totally thrilling and addictive psychological thriller about marriage, buried history and how little we can truly know the person we love.