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. 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.