Claire wants to find her son, taken from her by the Community, but she is powerless against all their rules. So she starts to design a plan to steal him back until she learns that someone else has run away with him. So when she flees the Community in pursuit and loses her memory, she has to work first to get her memories back. Then, she makes a deal with Evil so that she can achieve her goal.
This book was part four in The Giver quartet by Lois Lowry. It answered some of the questions I had from the first book, but not necessarily all of them. For example, I still have MANY questions about what happened to the Community after Jonas and Claire left. I enjoyed finding out what happened to Jonas and Gabriel, but I'm not sure I'm satisfied with the ultimate resolution.