Mysteries Revealed

Kyah is a twin, Isobel. But, Isobel went missing when they were five, the summer they were going to start kindergarten. They haven't been able to find Isobel, and that makes her parents and her older brother protective of her, afraid to loose yet another daughter. But Kyah meets someone in her history class who is trying to find out her family secret. Why is her brother so protective, why her parents dont her stay out late, why it seems like she has no social life. Until Kyah realizes mystery boy may have a few secrets of his own. Will they be revealed?