This was so good. It was almost like two short stories. The first third of the book was Adam and Mercy's wedding and honeymoon. The last half was Mercy and Adam fighting a river devil causing trouble in the river they were honeymooning next to. 
 I loved the wedding and honeymoon. It felt like a gift to me as a reader and fan to see Mercy and Adam learning to be married to each other. 
 The adventure with the river devil was good. Part of it was Mercy learning about her father's side of the family. 
 I don't know that this was a book that moved the series along that much. I also think it's enjoyable because I know the series well; I don't think it would be as good to someone who started the series with this book. It was a good read, though.