Annie Berkley, a schoolmate of Shelby's who has appeared in previous books, lives in a foster home and has become depressed. Shelby is concerned and eventually wins over Annie's trust in order to find out what's bothering her. Annie's mother disappeared several years ago, leaving with her boyfriend when Annie was 8. she was never in touch with her daughter again. But now, the boyfriend has returned, saying that he lost touch with the mother...