I give this more of a 3.5 than a 4 but goodreads doesn't let me do this! I really liked the idea behind the book and the actual action involved. It was different than many other books that have become best sellers. I enjoyed reading this book quite a bit and had a hard time putting it down, often because of long chapters. I just felt like something somewhere was missing and I just couldn't figure it out. Maybe it needed an epilogue? Either way, I already have decided that I liked it. Maybe there will eventually be a sequel?