The story is about a history teacher who visits a friend in his diner. The friend shows him that there is a portal to the past in the storeroom and asks him to go back in time to prevent the assassination of President John F. Kennedy on 22 November 1963. Jake Epping travels to the past and tries to change other events with great difficulty. Each time he returns to the diner, the past resets. Goodreads rates it 4.31/5.