this is a free pdf. i read it, it's a great novel.here's a review from amazon. i read it a long time ago, and loved it.
about the unseen spiritual warfare that takes place around us
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Posted April 9, 2010, 7:28 PM EST: This book was one of the best I had ever read. When people first told me about Frank Peretti's books, I was a little skeptical. I thought that the topics would leave me with nightmares or being afraid no matter where I was by putting a face to the spiritual warfare that occurs all around us every day. I was wrong. This book became one of my favorites a few chapters in! Peretti's writing style is phenomenal. He puts everyday occurrences into perspective in a HUGE way! The plot becomes very dramatic, very thick, but he never loses the reader. Every little thing ties together in a way that is readily understandable and very deep. This book is one of the most spiritual I have read! Strongly recommended!
here's the link for the free pdf, 3rd link down