That's right, the seventh Harry Hole book, and, because I read these out of order, the last one in the series for me to read. This one is the first one optioned to be turned into a movie (optioned I think in 2014, though you can probably search and figure that out quickly). Of all the books, I have to say I agree that this one would make the best movie, though all of them would be good.
Having read the previous six and the subsequent three, I knew what was going on around this book. I knew how it was going to end, and I STILL didn't see all the twists. I knew a couple were false, but didn't really know that others were twists except for the fact I wasn't near the end of the book. That said, I was still deeply engrossed, reading fast, and agitated during the climax of the book.
All the expected characters were in the book. If you are reading them in order, then this book is an OH. MY. GOD. in its conclusion.
Having not particularly liked the first Harry Hole I read, I am somewhat delighted at now being a fan. Lots of gruesome, ahhhhh-cannot-unthink scenes, but Nesbø's twists and puzzles and misdirects are just way worth it. The broken hero story makes it more appealing.
This book is readable stand alone, but for maximum impact and oh shit revelations, read them in order.