Dresden number 12 and Jim Butcher is cranking on all cylinders here. Everyone and everything so far comes back together in this story, providing a lot of closure both for Harry and the reader as long dropped story threads suddenly get a resolution.
Summary: Harry's half-vampire erstwhile girlfriend Susan shows up with dreadful news for Harry. The child he didn't know he had has been taken by the Red Court. Harry, predictably, goes pappa bear and calls in every favour he was ever owed - and considering who some of those favours were owed to, he's screwed however this goes down. Harry doesn't care, all he wants is to save this one little girl, no matter the cost.
Well you can probably figure out how this goes down, with a great big offer from Mab on the table - even without reading spoilers, it only surprised me how long into the story it took for Harry to go to her, so I don't think I'm giving away too much here. Even the twist in the final few pages, wasn't unexpected and to get a book ahead of myself, the who and the why was pretty obvious if you thought about it, and Harry, for about 30 seconds.
There's not a whole lot to say really, if you're still a Dresden fan at this point, it's great. Tightly plotted, draws heavily on all the wonderful continuity and world building done so far, and yes, the writing has come a long long way since the early books. I liked it, a lot.