Isaiah (Understanding the Books of the Bible)
As I discovered while writing a study guide to Isaiah, this is one huge book.  It's vast in size and scope, addressing events over a 150-year period.  It's monumental in the grandeur and timelessness of its language.  Its theological ideas are profound and groundbreaking.  Anyone would feel dwarfed even reading the book, much less writing a guide to it.  But I hope that this guide, because it takes an unconventional, non-sequential approach to the book's contents that is nevertheless chronological historically, will help readers feel much more comfortable engaging this masterpiece of world literature and theological insight, an anchor of the prophetic section in the Bible.  I hope you enjoy reading and studying Isaiah as much as I did!