I enjoyed the other installments in Kendare Blake's Three Dark Crowns series enough to preorder this novella, and I can't say that I regret that I spent the money. This was an interesting little installment in the story of the three queens, and a nice amount of background that fleshed out and clarified a couple of things that the first two books revealed but didn't get into in great depth.
On the other hand, while I enjoyed reading this novella, I can't say that it added anything concrete to my knowledge of the situation. It added depth, but I'm honestly not sure that this was a necessary installment of this story. If you're just dying for a little more of this universe, by all means read it. It's well-written and entertaining. But I don't know that you'll really learn anything you didn't already know. I, personally, found this to be ultimately unsatisfying.
3 out of 5 stars on Goodreads.