I'm sorry! I mean to do a post to my Livejournal about it, but never got around to pulling together all the information. (The only Jim Butcher book I did in its entirety was White Night, but there were some others, including a western and a couple of fantasy novels.)

But I can put it in a comment for you! Well, possibly more than one. You may regret that you asked. :D

Here's what I had written down when I got burned out and quit on the blog post I was making:

404 pages
43 chapters

average 9.4 pages per chapter
8.9 pages not counting last chapter (which is really long)
8.4 pages as of ch. 32 (the chapters get progressively longer)

Basic plot:
Someone is murdering women in Chicago who possess magical ability. Harry's brother is a suspect, but turns out to be helping instead, by rescuing & hiding victims. The killer is unmasked and killed, but turns out to be part of a deeper conspiracy that involves power politics among the vampires. Harry & co. crash a gathering of vampires and challenge the person behind the conspiracy to a duel, eventually killing him and establishing a new balance of power.

Emotional or plot high points:
Harry learns Thomas is a suspect (50)
Elaine turns up (89)
Thomas revealed to be a good guy (156)
The Skavis unmasked (240)
Harry has a plan - launch last third of book which composes finale (270)

I initially had a lot of trouble figuring out where this book's major plot turns are located. Eventually, going mostly by page count, I decided to diagram this book as breaking into three parts:

First third: Thomas is a suspect; Harry pursues leads & eventually tracks him down & learns that he's not the killer. First mini-climax when Harry sees the picture of Thomas at Anna's apartment, thus confirming his suspicions about Thomas; this leads directly to the fight with Thomas & the ghouls at Thomas's boat. This reveals that Thomas is not the killer and Madrigal Raith is one of the major baddies.
Second third: Finding the real killer - the Skavis - and fighting/killing him. Mini-climax in the fight w/the Skavis and Elaine being hurt. During these two thirds, all the pieces are set up for the reveal of the conspiracy and the final confrontation in the Deeps.
Final third: Confronting and fighting the real baddies (the White Court) culminating in a huge battle sequence & then the falling action.

But the middle "third" is shorter than the other two, and something just wasn't working here. It clicked when I started diagramming "Blood Rites", which is somewhat more obvious in its plot structure, in that it has a huge turning point halfway through the book. I started flipping through several of Butcher's other books and noticed that they ALL do that -- there is a really big turn located more or less in the middle. (rydra_wong later pointed out to me that Butcher's got a blog post on that very subject: The Great Swampy Middle.)

Anyway, going back and looking at White Night, I realized I'd been going about this all wrong. I'd been looking at page count, but it breaks completely differently if you look at it in terms of chapters, which is, after all, how the author probably had broken it down in the original outline. (The chapters get progressively longer as the book goes on, which makes the first "half" deceptively shorter than the second.) But looking at it in terms of chapters, suddenly the pattern snaps into focus:

First half: Someone is killing women and Harry's brother Thomas is the prime suspect. Harry pursues leads & eventually tracks him down & learns that he's not the killer, revealing that there must be another hitherto-unknown killer.
Second half: The real killer, the Skavis, is tracked down and killed, catapulting us into the final confrontation & climax.