The Descent marks the ending to what I believe has been one of the most surprising trilogies I've ever read. The different twists and turns throughout the series as a whole have been a lot. The characters that can be so dispicable and evil one moment try so hard to overcome and gain forgiveness for their variable and many sins. 
 The Descent picks up four years after The Reckoning. Lanny has been living away from Adair, not certain she wants to be around him after his declaration of love. Not sure if she can believe him. After experiencing terrible nightmares showing Jonathan being kept and tortured by the Queen of the Underworld, Lanny knows that Adair is the only one who can help her save Jonathan. Little does she know that this quest will ultimately force her to look back on herself and her life and finally come to decisions about herself she has maybe put off for far too long. 
 This trilogy started out as Lanny's story, but it's become very apparent that Adair shares the spotlight as well and no where does he do it more than in The Decent. Adair has been trying to show Lanny that he can be good, can be changed. He's sequestered himself on a remote island hoping to serve up pennance for his past indiscretions. Has he really changed? Can he really change and become who Lanny needs and who he wants to be? It was very interesting that we finally got the full story of Adair's life. Up to this point we've read bits and pieces of different times in his life, not sure what was truth and what may have been fabricated. Well, it's all laid out here. 
 I found the book to be one of those that I don't want to put down, I wanted to rush through to see how it would ultimately end. I will say, however, that I found there were a few threads that I thought were maybe rushed. Story threads that, in some cases, have been set up from the beginning of the series and because they weren't deeply involved in the ultimate end, Alma Katsu decided to just find a quick and acceptable ending for them. I dislike it when authors do this because it alsmot feels like why bother to introduce these threads in the first place. 
 Besides that little quibble, I enjoyed The Descent as well as the rest of the trilogy. There were times throughout reading the series that I was shocked with myself for sticking with it as long as I did because of all the various flaws and few redeem abilities of the characters. I'm glad that I did. It was a very thought-provoking series. I'll be interested to see what / where Alma Katsu takes us next.