My best advice is to not read the back-cover summary. It completely spoils what is, I thought, a pretty cool twist. The mystery in this one was interesting, and, if you weren't already spoiled by the back cover, keeps you guessing. There was plenty of action and some well-executed suspense. The boys got a chance to show off a lot of different skills, especially Joe. There are also some good scenes of the brothers interacting. Callie got to play a pretty big role in this one, and she was fun. Again, I think would have enjoyed the book a lot more if I hadn't read the summary. In any case, it's an exciting read with solid characterization. It kept me turning the pages.