Nineteen stories about George Raison, a talented policeman who devoted his life to investigating the “hangings” that had been gathering dust for years in the archives of Scotland Yard. Nineteen terrible crimes that for the time being remained unsolved. No evidence? Are the testimonies contradictory or non-existent? But George Raison is sure that there are no “perfect murders.” Every criminal makes mistakes - even if they are so small that the police who led the investigation earlier missed them. However, there is no such trifle that would escape the sharp gaze of Rayson, who firmly believes that, no matter how many years pass, retribution overtakes the murderers.