Overall this was a very good story and a satisfying close to the series. I do think the ending felt a bit rushed, but only in the one storyline. There are several plot lines going on with the main character. He is a young druid sent on his first assignment to advise a king who doesn't intend to listen to his advice. Also he must deal with Ida, an evil immortal woman created by his uncle and set free upon his uncle's death. While all he really wants to do is search for his sister, stolen by Fey at birth.
All of those plotlines do resolve satisfactorily and with sufficient interest to be worth reading. The author also introduces another line, while he is in the Fey realm he encounters the "Old Ones". The beings that were there before the Fey moved in (centuries ago). They enlist his help to finally fight back and drive the Fey out of their realm. He's told that he needs to find allies. When the book was nearly finished and nothing has happened to further this plot I figured that it would probably be left for another book or a sequel series. Which would have been fine since the major plots were all resolving well enough and this one wasn't important to the flow. But then suddenly he just walked into a scene and it all just goes down and all those allies he was gonna get never even happen and then boom, it's over. So that feels really rushed, but other than that one thing the rest of the book is pretty good.
The world is decent. Mostly a generic ancient Europe with magic kinda thing, with not much original to it but it holds together well. Mostly. (A few things seemed unrealistic but nothing worth mentioning.
The characters are all believable, which isn't as common as it should be, so that's a feather for the author's cap. I think most of the book could benefit from a little more emotion, which would make the characters more endearing, but at least they seem real.
The story is unique, and even though it's a conclusion to a trilogy, it could stand alone if needed.
I read the first book in the series and then skipped ahead to this one. I enjoyed both books and would recommend them to anyone interested.