This volume takes a more standard Steampunk feel than the first. I've noticed several reviews that did not care for this or the third volume, and I suspect the shift to more standard action fare is part of that. There is certainly less romance than in Soulless. The other reason I imagine many people don't care for this as much is due to a shock near the end of the book that does significantly change the interpersonal relationships that have been built up to now. I'm glad that I already have Blameless, as I will be reading it next to see the resolution despite previous plans to explore a different series. 
 Changeless presents a Steampunk mystery that still deeply involves the supernatural characters of the world. Gadgets and technology come more to the front, and several interesting new characters appear. The protagonists' histories are explored some, providing greater depth and explanation for their actions. Readers who were excited by the romance in Soulless will be let down on that front in Changeless. Those who were interested in the Steampunk aspects will find more familiar settings. The plot rolls along at a brisk pace, and clues for the mystery are provided to allow the reader to unravel the main points as they go but still makes the reveal to the characters enjoyable. I did see the final reveal coming, but I did not anticipate the reactions of those involved.