Fowles achieved instant recognition with his debut, The Collector (1963), a chilling psychological thriller about a butterfly collector who kidnaps a young woman. His second major novel, The Magus (1965), a complex tale of manipulation and self-discovery set on a Greek island, became a cult classic. His masterpiece, The French Lieutenant's Woman (1969), is a Victorian pastiche featuring an intrusive narrator and multiple endings, acclaimed as a landmark of metafiction; it was adapted into an Oscar-nominated film in 1981.
His later novels include Daniel Martin (1977), Mantissa (1982), and A Maggot (1985). Fowles also published essay collections such as The Aristos and The Tree. Recurring themes in his work include freedom, existential choice, the tension between nature and society, and the mysterious forces governing human relationships. He remains one of the most influential British novelists of the twentieth century.