What if you woke up to discover that you'd killed the only woman you had ever loved? Alastair Cunningham wakes up in hospital with almost total amnesia. But he knows that something terrible happened in his past, something that haunts him still. A young family friend, Clémence, is called in to help rekindle his memory. Retreating with Alastair to his remote cottage by a Scottish loch, Clémence finds a peculiar manuscript hidden away from prying eyes. Reading the prologue, she discovers a murder by someone very much like a young Alastair. The victim? Clémence's grandmother, Sophie. Could this kindly old man truly be a killer? Clémence becomes determined to find out what happened all those years ago, even if she must risk everything to do so...