Unholy: Forgotten Realms: The Haunted Lands, Book 3

I don't like to do reviews, but after listening to all 3 books, I am left with no other choice.
The series is really quite good, and gave me characters I really came to know and like. The griffon rider aoth kept my attention, as did barreras,, tamith and the various underlings and contemporaries that colored in the world. Zoss tam, the ultimate bad guy is voice acted very well, and each plot twist kept me intrigued throughout all of the books.
Without revealing spoilers, there are a couple of things that almost ruined the experience, however; first, this world is literally overrun and dominated by undead, that is, every citizen interacts with and sees zombies, wraiths, skeletons,etc., on a constant basis; second, the ending is an abomination worse than the undead characters themselves. In the case of the former it is hard to imagine how any living creature would want to continue living--even in a fantasy world--in such a setting. In the case of my latter complaint, it really seems that the author was supposed to write more books, but just never did? Please someone tell me there is a continuation of this series that I am missing? To invest 30 hours in listening to something only to have such a horrid ending is so disappointing I almost screamed.