Justine is narrated by an impoverished Irishman, not named in this novel, but who is referred to as "Darley" in the later novels of the quartet. He is a struggling writer and schoolmaster, with a background and a number of personal experiences similar autobiographically to those of the author himself. From a remote Greek island, he retells his time in Alexandria and his tragic romance with Justine – a beautiful, mysterious Jewish woman who was born poor and is now married to a wealthy Egyptian
Copt, Nessim. and with a cultural milieu that mixes exceptional sophistication with equally remarkable sordidness. Justine is portrayed by Durrell in a manner which 'mirrors' Alexandria in all of its complexities, with its mixture of elegance and extreme poverty, and its ancient Arab ways co-mingled with modern European mores. Durrell's Alexandria is a city where Europeans exist alongside Egyptians, and Jews and Christians exist alongside Muslims, and his characters, especially his lovely protagonist, she of the "sombre brow-dark gaze", mirror the city. For Durrell, his protagonist Justine is the essence of Alexandria, its "true child … neither Greek, Syrian, nor Egyptian, but a hybrid." The character of Justine – who is portrayed by Durrell as alluring, seductive, mournful, and prone to dark, cryptic pronouncements – has been described as the centrifugal force of the novel. The narrator and Justine embark on a secretive, torrid love affair. As the adulterous lovers attempt to conceal their growing passions from Justine's husband Nessim, who is also a friend of the narrator, the resulting love triangle grows increasingly desperate and dangerous, with the narrator fearing at the book's climax that Nessim is trying to arrange to have him killed. In the novel there are allusions to another, parallel and fictional novel by a former husband of Justine's, titled
Moeurs ("Mores"), which the narrator reads obsessively in his search for clues about Justine's past life. In doing so, he learns of her propensity for many lovers, her complex sexuality, and her perpetual angst. He also discovers a diary that is kept by Justine, and quotes long passages from it in telling her story. ==Style and characters==