My Reaction in a Nutshell: 
 That ending. 
 The Long Version: 
 In typical Sanderson fashion, The Bands of Mourning includes fighting, problem solving, some comedy, and an adventure. In this book, Wax, Wayne, Marasi, Steris, and MeLaan travel to New Seran to find ReLuur's missing spike, stop Suit, and save Wax's sister. After Shadows of Self, Wax and Harmony aren't exactly on speaking terms. Things get complicated, and lots of gun fire occurs. 
 I'll be honest, I didn't really enjoy Steris' character in The Alloy of Law. She was pretty much there for comedic relief and to add a bit of a (forced) love triangle (plus she had the personality of a rock). In Shadows of Self, I started to enjoy her character development. She surprised me a great deal, and I loved her interactions with Wax. In The Bands of Mourning, I love Steris. She's practical and knows how to be safe. She isn't an annoying character who tries to help but only ends up endangering everyone else around her instead. Steris is wonderful. I love her interactions with Wax even more in this book than the previous one. Although in the first book I liked the idea of Wax and Marasi together, as the series progresses, I realize that the two aren't actually a good fit. 
 There is a great deal of character development in this book (and fighting action too). Although it seemed like most of the book consisted of gunfights, Wax, Wayne, Steris, and Marasi all discover important parts of themselves that in previous books they weren't quite yet ready to face. 
 I enjoyed this book. Although I am a bit bummed out that I'll have to wait a long time before the the conclusion of this series to come out. 
 ***TRIGGER WARNINGS: kidnapping, person kept in cage, death, murder