So, uh, massive spoilers for not so much this book but for the entire series through Peace Talks, which is not yet published as of this review. Don’t read farther unless you don’t mind.
Without yet having checked my previous review of Death Masks, I assume that I liked it quite a bit, since all of the Dresden books have hit me pretty favorably. And yet, reviewing the audiobook relisten in my head, mostly what I think of it is… well, that’s not fair. It’s still extremely positive. The war with the Red Court is really heating up, we get the first real glimpse of the Denarians, Marcone is humanized, there’s some big movement with the Knights of the Sword that, if I remember my timelines correctly, has only recently paid off. Plus, they finally introduced Molly, who appears to have set off the chain of events leading to Harry’s procreation. A lot of really important things happened!
The problem, if there is a problem, is that everything I’ve said (or almost everything) is groundwork for future books. Whereas my actual experience of Death Masks as a book was: you know, it was fine. Butcher has already written better single book mysteries and anyway it only reached half-resolution, and only via deus ex missourian at that. I mean, unless you care how the Shroud of Turin thing turned out, which I suppose is fair enough. The problem, briefly expressed already a paragraph above, is that this makes me sound sour on the book, and I’m not! It was, y’know, fine.
Anyway, the by far more important part, my timeline update. The book occurs in February of year 3, seven months after the book prior. And various events lead me to conclude that okay, probably Harry’s daughter was conceived during this book, rather than being 6 months old already. Which makes her birthday in November of year 3 rather than Augustish of year 2. (Because, see, I’m still making this calculation easy on future me. Woohoo!)
 Guess: correct! Shockingly.
 Which has stuck with me ever since even if the details of how it happened had not.