The novels of C. Ruiz Zafon are a product of a vast creative experiment, which results in the coexistence of several literary genres and styles in the tissue of just one work. His books show a close interconnection in structure, plot and content. This article deals with Zafon's works as an example of magic realism, whose aesthetics puts under question the reality of reality itself. Particular attention is paid to the category of duality and its manifestation in the ethical dualism of Good and Evil (Blessing and Curse), their identical duality. The article raises the problem of duality of the world and the person as an inalienable characteristic of the author's mythological and linguistic pictures of the world, which is thoroughly antynomic in Zafon's works. The problem of duality is studied in connection with similar literature tendencies created in the course of various art movements. Its comprehension is connected with the motives of shadow, mirror, game, dream, and mask. The dualism of Good and Evil is defined as the dominant metaphorical basis of the artistic picture of the writer's world and is regarded as one of the main system-forming elements of his works, motive and principle of author's world-modelling. The dualism of the Good and Evil crystallizes into the dominant metaphorical picture of the writer's world of art and is one of the main system-forming elements of his creativity, the motive and the principle of the world-modelling. The intertwining of reality and fiction allows us to say that C. Ruiz Zafon is the heir of Cervantes, who created this conflict of reality and fiction, the struggle between the Good and Evil and a dreaming hero, who has to confront the reality in which the truth is more incredible and strange than the fabrication itself.