The concept here is fantastic. Would you want to live your life with zero fear? How would it change the way you relate / react to the world? My daughter and I both enjoyed this book and I loved that it gave her (aged 12) a very powerful female protagonist. Having said that, some of said protagonist's behaviors are extreme. There is a nice cast of characters here to balance out her energy. We have both also read the next two in the series, "Sam" and "Run," and enjoyed them. I doubt, however, that we will continue the series to read the next 30 or so books.