Aside from a rushed ending, Book 4 has been one of the strongest and most cohesive installments so far. It was nice to get some answers to a lot of the mysteries broached thus far - especially in the first two books. Unsurprisingly, we were left with a whole lot of new questions, but it would be The Lost Tomb without that. :D I enjoyed this one a lot, and read it in only a few sittings!