Satan A Biography, by Henry Ansgar Kelly. ISBN 0-521-60402-8. This book provides a discussion of the character Satan as it occurs in (mainly) Christian literature. Jewish and Muslim ideas are considered only briefly. The main thrust is the "Old" vs. the "New" Satan. The Old Satan is found in the Old Testament and New Testament books while the New Satan is developed later by Christian writers like Justin Martyr. I found this book very interesting and was especially interested in the wide variety of books the author consulted to make his case concerning the Old vs. New Satan.