First thing: I kind of dislike Gordon Korman now, for leaving cliff hangers at the end of the books in this series. Every time, it's the worst possible moment to end, especially with the second book in the series, and the third book isn't out yet.
Also, I really hate Hector Amani! He acted like he really missed Eli, Malik, Amber, and Tori, but really he was just leading the Purples to them. I especially hated how Hector said he was sorry--he should've thought about being sorry when he had made the deal with the Purples! Plus, Hector doesn't even act like he really missed Eli, Malik, Amber, and Tori when he first comes back, he just whines and complains about how they left him alone, when it was Hector's own fault he wasn't with the others! It made me mad that Hector acted as if he was a friend, but he was really a traitor. But I liked how Malik didn't feel sad when they realize Hector betrayed them, he just tells Hector he would be sorry.
Just one thing I didn't like about the book, and that's why I didn't rate it a 5-star, is because it seemed like the plan for everything only came from Tori, which I didn't much like, because I knew the others had potential for ideas too. I also disliked how Tori always said things like: "I guess it's something about being an artist." It was annoying and almost selfish how she made those statements.
Besides what is mentioned above, and the cliffhanger, I really liked the book; the characters had nice personalies, and their adventures were exciting and left me on-edge.