All Fall Down, Paperback/Ally Carter

Grace Blakely is absolutely certain of three things: 1. She is not crazy. 2. Her mother was murdered. 3. Someday she is going to find the killer and make him pay. As certain as Grace is about these facts, nobody else believes her -- so there's no one she can completely trust. Not her grandfather, a powerful ambassador. Not her new friends, who all live on Embassy Row. Not Alexei, the Russian boy next door, who is keeping his eye on Grace for reasons she neither likes nor understands. Everybody wants Grace to put on a pretty dress and a pretty smile, blocking out all her unpretty thoughts. But they can't control Grace -- no more than Grace can control what she knows or what she needs to do. Her past has come back to hunt her . . . and if she doesn't stop it, Grace isn't the only one who will get hurt. Because on Embassy Row, the countries of the world stand like dominoes, and one wrong move can make them all fall down.