This book presents a novel theory of fictional entities which is syncretistic insofar as it integrates the work of previous authors. It puts forward a new metaphysical conception of the nature of these entities, according to which a fictional entity is a compound entity built up from both a make-believe theoretical element and a set theoretical element. The fictional entity is constructed by imagining the existence of an individual with certain properties and adding a set-theoretical element consisting of the set of properties corresponding to the properties of the imagined entity.

Moreover, the book advances a new combined semantic and ontological defence of the existence of fictional entities.

Résumé
This book is devoted to fictional entities or, to be more precise, fictional entities as they emerge from the literary process of storytelling. They encompass the great immortal figures in human literatureDon Quixote, Faust, Sherlock Holmes and so onas well as the protagonists of single novels such as Anna Karenina, Emma Woodhouse and Emma Bovary and even the unknown characters in the oral tradition of storytelling developed by small communities of people for their own entertainment. This is p- sumably how Achilles, Penelope and Ulysses originated. We must also include among these figures mythological characters such as Apollo, Odin and Zeus, regardless of the fact that they were originally thought to be supernatural beings rather than fictional individuals. The subject of this book is not new, which may make it seem less appe- ing to a prospective readerjust one more book on fictional entities. Yet I would argue that this apparent drawback is fundamental to the purpose of the book, which is to present a syncretistic doctrine of fictional entities. In other words, it is a theory which firmly acknowledges that the various other theories already developed on this subject have great merits. Their main flaw, however, is not that they are wrong but, rather, that they are inc- plete. Accordingly, they are not to be put to one side; instead, they need to be integrated into a single theory that aims both to maintain their positive results and to overcome their defects.

Contenu
The Metaphysical Side.- The Committal Theories (I).- The Committal Theories (II).- The Syncretistic Theory.- Further Developments of the Syncretistic Theory.- The Semantic Side.- The Noncommittal Theories.- The Syncretistic Theory.- The Ontological Side.- An Ontological Argument in Favor of the Existence of Fictional Entities.