Æs Triplex is a short story by Robert Louis Stevenson: The changes wrought by death are in themselves so sharp and final, and so terrible and melancholy in their consequences, that the thing stands alone in man's experience, and has no parallel upon earth. It outdoes all other accidents because it is the last of them. Sometimes it leaps suddenly upon its victims, like a Thug; sometimes it lays a regular siege and creeps upon their citadel during a score of years.