I got this book from Netgalley, and am so glad I did! I'm a huge fan of Robin Wasserman's books because of the Skinned series, which I think is now called the Cold Awakening series. But anyway, this is a really good book. It is one that makes me realize why I can never finish any of the books I start. The depth of the detail and the back story in this is incredible! I love books that use letters or flashbacks to historical diaries or events like this one does. In a way this is a Da Vinci Code type of book in that it brings in an ancient religious sect. I also like the sciencey part to it, as I am a science teacher. This was a big book, lots and lots of story to read. It starts out and says where it starts is the middle of the story. But really, while it is kind of the start of the whole 2nd part, the 2nd part is HUGE! Not in a bad way, just you get to that part and it's not really the middle of the book, just the middle of the story. I do like that it starts like that, so that you know kind of what is to happen, but you don't know just what will happen after that until you get to that part. I loved that I was kept guessing on whether the boyfriend, Max, was a bad guy or a good guy the whole time. So many clues led you back and forth. And the cousin, the unknown guy who shows up after Chris's murder, again, you don't know if he's good or bad. I kind of wanted to like Eli, hated him at first for how he talked to Nora, the main character, but as the story went on, really liked the love-hate relationship they had, I often enjoy those types of stories.The story talks about an elusive machine that is supposed to get the maker/user in touch with God, it is called the Lumen Dei. The way it works at the end when they finally get it together is really good and totally adds to the whole story, and makes up for waiting all through the story to know what it will really do, although you're not left knowing what actually happens.Great book, I'll be putting it as a staff recommendation at the bookstore where I work when it comes out in January.