Throughout A Separate Peace Knowles employs a frame story and flashbacks to structure the narrative. This begins with Gene’s return to the Devon School and transitions into an extended recollection of his experiences during World War II. This structure draws readers into both the events Gene narrates and the effects of his changing perspective, as seen in Chapter 1:
Looking back now across fifteen years, I could see with great clarity the fear I had lived in, which must mean that in the interval I had succeeded in a very important undertaking: I must have made my escape from it.
The frame story of Gene remembering his adolescence establishes that much of the novel will be centered around the importance of his school-age experiences to his adulthood. It sets up Gene’s time at Devon as a crucial period of change and growth in his life. By starting with his return to the school as an adult, the narrative suggests that the events Gene recounts shaped him in ways he can’t avoid. This approach also brings the reader closer to Gene’s past, as it bridges the gap between Gene’s 16-year-old self and his present understanding.
The extended flashbacks immerse the readers in Gene’s memories of Devon and the war years. Through this retrospective narration, readers gain insight into his evolving understanding of envy, love, and guilt. Although he can acknowledge that the events that seemed important to him as a teenager might be minor, he also can’t get away from how they shaped him. Gene’s acknowledgment at the end of the book of the fear he once lived with comes alongside his claim of having at last "escaped" it. The flashback structure within the frame story allows readers to see how time and maturity reshaped Gene's interpretation of events.