Introduction: A three-part story about a mad scientist, a child of death, and a man plagued by imminent doom.Part 1:  He's the last man on earth, and it's all his fault.  The time counts down as Cain fights against the remains of a fallen world in order to complete a mysterious mission.  Where did all the people go?  What is Cain's goal?  Find out in "A City of One."Author recommendation: This story is best read slowly with sad music playing in your ears.  (The Interstellar soundtrack and the song Undaunted, by Audio Machine, are some excellent tone-setters for this tale.)...