"Mantissa" by John Fowles is a metafictional novel that follows the dialogue between Miles Green, a novelist, and his Muse, Erato, as they engage in a philosophical and often contentious exchange. Set against the backdrop of Green's struggle with writer's block and his own identity, the novel explores themes of authorship, creativity, gender dynamics, and the nature of literature. Through their dialogue, Fowles delves into contemporary literary theories, including postmodernism and feminist criticism, while challenging traditional notions of storytelling. The narrative is characterized by its intellectual depth, satirical tone, and provocative exploration of the relationship between the author and his characters.