The author extensively details, analyses and compares key concepts and strategies of fictional worlds theory: a theory which has, over recent years, developed rather rapidly and is connected with leading scholars in the area of literary studies, such as Lubomír Dolezel, Umberto Eco, Thomas Pavel, Ruth Ronen, and Marie-Laure Ryan. The book focuses on theoretical suggestions from which the fictional worlds theory borrows its main ideas, that is, logic, semantics, and linguistics. It also examines areas of literary theoretical investigation, in which the fictional world theory has proven itself to be a significant tool for conducting more detailed research, namely intertextuality, fictional and historical narration.