Somebody changes the past for the better?

Jul 2017
421
Memphis
#1
I felt I was screwed by Stephen King's 11/22/63.
Are there any books where somebody actually goes
back in time and changes things for the better,
such as saving JFK and nothing bad happens?


Stuff where things turns out bad has been done to death.

Over 1000 pages and same old same old:think:
 

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