"whatever happened to Janie?"

The book that I just started seems to be very good so far. It is about a girl named Janie who sees her face on a milk carton, saying that she is missing. She tells a lawyer about it, and soon finds out that she was kidnapped from her real family when she was walking in a shopping mall with them. She then begins a long drive to New Jersey, where she meets her "new" family. Janie also finds, that her real, full name is: Jenny Spring... before it was Janie Johnson. She now, has three brothers, and a sister, when before... she didn't have any siblings at all!