Fiction is usually understood to be about the nonexistent. Nonetheless, we can speak about fictional characters and, ipso facto, about the non-existence. Moreover, we can do so despite the fact that at least some fictions violate the fundamental laws of logic. This project addresses the logical, epistemological and metaphysical implications of the phenomenon and proposes a unified theory of fiction. The main hypothesis of the project is: since fictions violate at least some principles of classical logic, one needs to venture beyond classical logic to address philosophical issues pertaining to fiction. The standard way to do so is to employ some hyperintensional frameworks, mainly impossible worlds approach and structuralist approach (see Jago M., The Impossible: An Essay on Hyperintensionality, 2014; Duží, M., Jespersen, B., and Materna, P., Procedural Semantics for Hyperintensional Logic, 2010). Since the project connects the problems of logic, philosophy and aesthetics, it has interdisciplinary character.