Too long, too many silly red herrings. Reichs writes in such a way that if the reader hasn't figured out the most important of the mysteries (in this case, whatever happened to her childhood friend, Evangeline) long before the end of the book, then the reader has probably fallen asleep. All that's left for the usual Ryan-&-Brennan duo to do is find some of the bad guys. There is always a faux-tense scene near the end when we're supposed to believe the main characters might get killed, but they never do. In this one I found myself wishing Brennan would at least get hurt enough to knock some sense into her about how shallow and pretentious her books are.
For example, in this book, there is a completely needless character, Tempe's sister who, about half-way through the book, surfaces from a shallow and materialistic existence in Texas to rush to Quebec to "help" Tempe figure out the mystery. But, apparently because there's no real reason for her to be in the last quarter of the book, she suddenly drops out of sight. I don't recommend the books about Brennan. Borrow the TV series from the library and watch it instead. It's much better.