A man stands bewildered on a deserted beach on the Hebridean Isle of Harris. He cannot remember who he is. He is physically shaken, borderline hypothermic, and overwhelmed by fear and uncertainty. The only clue to his identity is a folded map of a path named The Coffin Road. He does not know where this search will take him. A detective from across the border in Lewis sits aboard a boat, filled with doubt. DS George Gunn knows that a bludgeoned corpse has been discovered on a remote rock twenty miles offshore. Though, having grown used to a quiet and predictable routine, he does not know whether he has what it takes to uncover how and why. A teenage girl lies in her Edinburgh bedroom, desperate to discover the truth about her father. Two years on from the pioneering scientist's disappearance, Karen Fleming still cannot accept that he would wilfully abandon her, regardless of the extreme pressure placed on him by his research.