Charlotte is deeply haunted by what transpired in the time she was with her keeper, and this is evident as she struggles with the reality of freedom now that she is no longer captive. She is a very strong, very brave character. She has breakdowns, which allow us to see her anger as she smashes things, and she has those incredibly strong moments where she's offering to visit her keeper for information on The One Before. Her strength, thoughtfulness, and utter devotion to finding out what happened to the other girl, makes this a very intriguing and heartfelt tale that sticks with you long after you'e finished reading it.
Alexia, or Lex as she called herself, is less developed. I found her to be the destroyer and the protector, but with no real personality. She did what Charlotte eventually realized she would do too. They are reflections of each other, and Lex is blurred as Charlotte is the focus. Sure, Lex enjoys wearing black, ripped clothing; she likes to torment herself; she blames herself. But that's because she's haunted, much like Charlotte is. And once that went away... she was similar to another character, Bailey.
This is richy written, and the author blended innocence and darkness perfectly. The surprises were well built up and played out wonderfuly. Child-like innocence mixes with the forced maturity that comes from being abused, and it makes for a great tone to let the story flow.
This book is one I definitely recommend.