It's another Dresden Files book, much like any other Dresden Files book in many respects, so I won't waste time discussing the commonalities. By this point in the series, you either like Butcher's blend of noir and urban fantasy, or you don't.

However, I did want to comment on a couple of things that bothered me in an otherwise excellent book. It is very aptly named, as literally everything changes in this book; relationships, possessions, powers, alliances, and literally the gods themselves come into play. That's all fun, despite the abrupt dark turn at a couple of points, but the ending was a bit frustrating. It's one of those maybe cliffhanger endings that just sneaks up on you, but it leaves Thomas, Molly, and Mouse off in lala land somewhere off the coast of Mexico. The ending also feels like it might be undoing the severe consequences of a decision made earlier in the novel, and one that I thought would be interesting to see play out, so it feels a bit of a cheap reset button as well. Other than that though, it's as enjoyable as ever, and I'm sure you know whether or not you'll like it by now.