Margaret Rogerson's Vespertine
I don’t really feel like trying to explain the plot here, as it’s tied to the (very interesting and cool) world-building, so I’ll just say it’s mainly about a girl who wants to be a nun in this fantasy religion, but then she gets possessed by one of the most powerful spirits, except he’s chill and wants to help her save the day from bad magic! It’s like Penric and Desdemona (yay!), but not really funny. Except this makes everyone believe she’s a saint, and she’s bad at dealing with people and does not WANT to be a saint. Eventually she begrudgingly (and adorably) makes friends and allies and they fight the bad magic etc. There are hints of a burgeoning romance for later books. This was hella fun, I’m psyched to see what she and her spirit get up to next. A-.