What is the main conflict in On the Genealogy of Morals by Friedrich Nietzsche?

Friedrich Nietzsche's "The Genealogy of Morals" is a non-fiction somewhat historical and philosophical discussion of the origin of morality and related concepts in mankind. Main body of the book is comprised of three separate but related essays written by the author dealing with the concepts of good and evil, guilt and bad conscience and meaning of ascetic ideals. Nietzsche comments on some historical events in the civilization of man in society over centuries to support his case for mankind's current condition in the late nineteenth century.