I'm not sure I'm going to able to write proper reviews of the individual books in this series -- this is one of those where the entire series likely needs to be reviewed.
Not really a cliffhanger ending to this one, but definitely not one to read as a standalone. Mostly everything and everyone just progresses. Oh, I really enjoyed the read because I'm invested in these people and this world. I wouldn't say it moved the series that far along though.
Yet, hard to review without spoilers. Let's just say I loved the book, the two brothers man-in-the-iron-mask got resolved, found out more about everyone, more about banes and wights, major reveal about the oldest Guile ... and yet and yet and yet clearly more to follow with nothing exactly resolved.
See? Not a very good review to basically say "loved it and found out more."