On the New England island of New Penzance, 12-year-old orphan Sam Shakusky is attending Camp Ivanhoe, a Khaki Scout summer camp led by Scout Master Randy Ward. Suzy Bishop, also 12, lives on the island with her parents Walt and Laura, both attorneys, and her three younger brothers in a house called Summer's End. Sam and Suzy, both introverted, intelligent, and mature for their age, meet in the summer of 1965 during a church performance of Noye's Fludde and became pen pals. The relationship becomes romantic over the course of their correspondence and they make a secret pact to reunite and run away together. In September 1965, they execute their plan. Sam escapes from Camp Ivanhoe while Suzy runs away from Summer's End. The pair meet at their rendezvous, hike, camp, and fish in the wilderness with the goal of reaching a secluded cove on the island.