I just read this, and wow. This is the Ted Dekker I know. I'm not really into the whole "religious book" thing, but his books are just so good that I don't mind some spirituality. (The book Three and Obsessed come to mind)
I picked up the 2nd in the series right away.
Just an FYI, the full 4 part series will be available for $9.99 in eBook format on 2/4/2013, but if you get each part on it's own it'll save you a buck since book one is free right now.