The author mentions writing this book during the COVID pandemic. While it is an apt metaphor for most of us being stuck within our four walls, as the fourth installment in the series, I found this book to be the weakest.

Several people (some we have not seen since book one) are gathered at the lighthouse to rescue Kihrin, and the entire story is told through flashbacks/visions.
In a book with a dozen or so characters, it is hard for me to care equally about all of them. In this book, all the side characters are given prominence, and in the fourth book of a five-book series, I just don’t have the energy to invest in all these romantic entanglements of side characters. And the fact that most of these people assembled in that lighthouse have had relationships with one or more of the others makes it messy.
I hope book five is less focused on all the love stories and more on the plot.