Thin Air  by Rachel Caine. After throwing Joanne through some serious crises and loss of loved ones, Caine effectively hits the hard reset button on her series in this fifth book, which opens with an amnesiac Jo waking up naked in the middle of the wilderness, unsure of who or what she is. As she tries to recover her memories, she's thrown into the middle of more djinn politics, and a science-fiction evil twin: the demon who has stolen her history and is doing it's best to convince the Djinn and the Warden that it's the real Joanne. Caine breathes successful new life into a series that had been escalating to a point that was hard to one-up itself. I'll likely continue reading these for the consistently solid characters and fun weather channel antics.