Dang it, it left me hanging! LOL, this was seriously good. I could not put it down and I just wanted to race to the end to find out how it was going to end. Except it left me hanging! Well, nothing to do but to move on to the next, ha! The last book (Brimstone) did leave you hanging, but at least it wrapped up a lot of the story line. And I suppose there were some things in this book that were resolved, but I think this was a true cliffhanger! In this one, you see a lot more of Diogenes as he and Pendergast pit their wits against each other. I have been reading Sherlock Holmes lately, so it's not surprising that I thought of Holmes and Moriarity as I read this book. While neither brother is exactly like Holmes and Moriarity, there are similarities in terms of the relationship they have with each other, as well as the massive intelligence of each. Holmes has mentioned that his brother is much more intelligent (but much more lazy) than he is, and Pendergast mentions several times that Diogenes is much more intelligent than he is. In any case, those of you who are fans of thriller/suspense/mystery novels who have not yet checked this series out should not start her, but go back and start at the beginning! It's definitely worth the ride!