It's hard to write a review that is not a comparison to either the first book of the series or to the other Sanderson series. But as I haven't written reviews to those, that's not an option.
So as a stand-alone book, this one tones down the fantasy elements a bit. Mind you, there are still present and very much in the foreground, but the magic/alchemy system has grown so complex by now that the book wisely choses to not depend on a deep understanding or even base it's story to much on discovering more unknown details about it. It rather just treats some characters as having super hero-like abilities to fancy up the action scenes and more than one time offer an easy way out (narrative-wise) to otherwise pretty dead-end situations. The thriller part can't really decide if it wants to be serial-killer hunt or whodoneit. It introduces some …