Gene Forrester is a quiet, intellectual student at the Devon School in New Hampshire. During the summer session of 1942, he becomes close friends with his daredevil roommate Finny, whose innate charisma consistently allows him to get away with mischief. Finny prods Gene into making a dangerous jump out of a tree into a river, and the two start a secret society based on this ritual. Gene gradually begins to envy Finny’s astonishing athletic abilities, manifested in Finny’s breaking a school swimming record on his first try. He thinks that Finny, in turn, envies his superior academic achievements, and he suspects that his friend has been taking steps to distract him from his studies. Gene’s suspicions transform into resentful hatred, but he nevertheless carefully maintains an appearance of friendship.