Daniel O'Malley's The Rook
It has been several years since I first read this, but the long-awaited sequel is coming out in just a couple of weeks, so it was time to revisit (since pretty much all I remembered was the protagonist's first name). Said protagonist works for a secret organization in England that deals with paranormal stuff--she's one of the weirdly powered higher ups there. Or at least she was, until a traitor in their midst caused her to lose her memories. Now she has to impersonate her former self, figure out who the traitor is, deal with paranormal emergencies, and help run this entire operation. It's a ton of fun. I was worried it wouldn't hold up, but it really does. I cannot wait to see where the story goes next. A/A-.