This book is a study of religious science fiction and fantasy in the tradition of Lewis and Tolkien. Sammons explores why writers use fantasy to convey theology. In addition, the book provides a theoretical understanding of fantasy as a form of literature by examining the techniques of current writers in light of the goals and theories of the founders of the genre. Sammons discusses techniques such as supposition, transposition, imagery, and reader participation, along with the themes and ideas they convey. The author traces the chronological development of the genre and the characteristics and effects of religious fantasy with a wealth of examples.