A time traveler attempts to live in the past to stop the Kennedy assassination. But in order to do so he must live, work, and be present in the past for years until the time comes. 

He can go back and forth between present and past but every time he does, everything resets. He continues to age while his actions have to be repeated over the course of years. 

When you go back who would you save? Where will the butterfly effect end? 

Once again this is a great King story IF you can make it to the end. He is still wordy af for no reason.