One Dark Throne is Three Dark Crown's sequel by Kendare Blake. The book picks up right after Three Dark Crown's events. The three sisters are planning revenge on one another and preparing to kill one another so only one of them can be Queen.
The book is told from a third person perspective and gives perspective to most of the characters.
I found the book to be slow moving, but towards the end it gets good. Betrayals occur, love, revenge, and action. I really enjoyed this book and want more to this series. The novella should be releasing at the end of this year or early 2018.
I give this book 4/5 stars.