Modern critics do not consider science fiction and mystery novels to be "serious reading", but Dorothy L. Sayers and C. S. Lewis questioned the boundaries between "popular" and "serious" literature. Both Christian writers critically discuss the spiritual crisis of the modern world in each fiction genre. This paper will discuss Sayers and Lewis from a Christian postmodernist perspective, that is, the acceptance of both human constructions, such as multiple views on genres, and divine revelation, or what transcends the limitations of humanity. Both Sayers and Lewis agreed in terms of their understanding that a writer is limited by human language, but also in terms of their acceptance of the transcendental guidance offered in the interactive relationship with the divine being. The discussion will present Sayers and Lewis as Christian postmodernist writers who re-evaluate generally overlooked genres, begin to argue in their respective genres that gender matters, and introduce the reader to another world beyond the boundaries of the known literary genres. (Contains 9 footnotes.)