For censorship reasons, in the film their age was increased to 16. Much of the content of the novel appears in the film, with several passages of text recounted by the film's protagonist Debbie (Nell Schofield) in a voice-over narration. The film closely follows the story and character trajectory of the novel. Some of the novel's characters are composites in the film. The tone of the novel is generally darker than that of the film, and in the novel Debbie and her best friend Sue, who join the surfer gang, are shown to be much more willing participants in activities than they are in the film. Some of the darker moments of the book have been removed or softened for the film. The film adds a comedy beach brawl between the surfers and the lifeguards not present in the novel.