This book compares the spiritual perspectives of Miguel de Unamuno as defined in his expository writings with those of Graham Greene as implied in his major fiction. It begins with a comparison between Greene's experiences and both Unamuno's early experiences and the spiritual world portrayed in his three major prose works. Then, as the moral consciousness of the protagonists in Greene's six religious novels, including "Monsignor Quixote, " is analyzed, their moral struggles are compared with those presented in Unamuno's prose works. The book shows that Greene and Unamuno are remarkably alike in the way their minds and emotions function, and that Greene's own hint about Unamuno's influence on himself is critically acceptable. This throws a new light on Greene's fictional world.