This is a long book, over 30 hours, but worth every minute. It's the story of Jake Epping. His friend Al has found a time portal to September 9th, 1958. Al has been using it to try to prevent the Kennedy assassination. But now Al is dying. He shows the portal to Jake and convinces him to take over the project. What could possibly go wrong?
Plenty. The portal has rules. First, while everyone else is whatever age they were in 1958, Jake is still aging normally. Second, the past doesn't want to be changed. The bigger the change, the bigger the resistance to change. Third, every trip through the portal erases any changes made during previous trips. Jake has to start from scratch each time he enters the portal.
Stephen King did a great job researching Lee Harvey Oswald. Jake has to be sure he's got the right man.And then there's Sadie.