On November 22, 1963, three shots changed the world. What if it never happened? Jake Epping is a 35-year-old high school English teacher in Lisbon Falls, Maine, who makes extra money teaching adults in the GED program. 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, and insanely impossible, mission to try to prevent the Kennedy assassination.