This was another fun and fast-paced book. Once again, however, there was a big similarity to the HP books that I would be surprised if nobody else caught. It really reminded me of Goblet of Fire with the other school coming to stay for awhile, the kids learning to dance for a ball, etc.
Still, give it a try. The spy angle makes it different and their covert operations training makes in interesting and suspenseful. All in all, a fun book full of smart girls that teens will enjoy reading about.