The movie takes place in the three days leading up to Lennon's murder and is intended to be an exploration of Chapman's psyche, without putting substantial emphasis on the murder. The title "Chapter 27" suggests a continuation of J.D. Salinger's novel The Catcher in the Rye, which has 26 chapters, and which Chapman was carrying when he shot Lennon. Chapman was obsessed with the book, to the point
550 artists were interviewed over ten years. At some point during those interviews, they were asked a question and told to answer with one word only. Some stuck to one, some said more, some answered quickly, some thought it through, and some didn't answer at all. That question… Lennon or McCartney?