There are pros/cons to reading reviews/looking into a series before you start. I'm often afraid of spoilers ... but I wish I'd known coming into this trilogy that the three books ARE connected and a continuation, but that the main character switches for each book. The three girls Ismae, Sybella and Annith are all introduced in the first book, and all make appearances in all three (and they should be read in order), but the first book is Ismae's story, the second Sybella's and this third and final book is Annith's. Also ... historical fiction with a strong fantasy feel. I mean, we're dealing with DEATH here, in a physical form. 

At the end of this book, there was an author's note which was very informative (stating how this was historically based, some events/persons taken from real records, although something shifted/timelines, etc). I so appreciate author's notes (and am grateful when they are included in the audio edition, it's a disservice when they are left off!). There is a Q&A that was only in the Kindle (I went with audio, but was able to grab the kindle copy as well). 

These are very much "romances" as well - nothing super sexual (although there is some action). No profanity. Death, literally, plays a large part ... so there's that/violence (these are nuns assassins).