The Demon's Covenant
Sarah Rees Brennan
 Mae has learned that her brother, Jamie, has magic powers. Gerald, the leader of the Obsidian Circle, is trying to persuade Jamie to join the magicians that tried to kill Mae and Jamie before. Mae tries to get Nick and Alan to rescue Jamie, but they themselves are in trouble. Nick has a new power that makes every magician in England want him dead. Mae knows she cannot trust anyone so she makes her own plan to save everyone.