11/22/63 by Stephen King

Jake Epping is a thirty-five-year-old English teacher in Maine. He receives an essay from one of the students—a gruesome, harrowing first person story about the night 50 years ago when Harry Dunning’s father came home and killed his mother, his sister, and his brother with a hammer. Harry escaped with a smashed leg, as evidenced by his crooked walk.

Not much later, Jake’s friend Al, who runs the local diner, divulges a secret: his storeroom is a portal to 1958. He enlists Jake on an insane mission to try to prevent the Kennedy assassination. So begins Jake’s new life as George Amberson and his new world of a troubled loner named Lee Harvey Oswald—a life that transgresses all the normal rules of time.