If this book would have concluded, or at least come to an understandable cliff-hanger, I'd have given it 5 Stars. As it stands, this book was fun, stressful, exciting, and extremely, vividly amazing. The writing is fantastic and the story is terrifying in its possibilities. Then, just as you're reaching another epic climax moment, it ends. Cut off abruptly, leaving you staring at the page like, "what the - ?" I'm still not entirely certain what Azimuth really is, or why it's circling the moon, but the actual apocalyptic story is fantastic. Definitely keeps you turning the pages for more.