I felt like this one was better than the first book. It might be because I know the characters a bit better and care more about what happens to them. I suspect it is also because "Six" is a kick-a$$ girl who is tough as nails and I simply love her character. Technically speaking, it's probably a 3.5 rounded up to a 4. There were still some things that I didn't like -- for instance, Olivia was a completely wasted opportunity for the author to do something interesting.