In all reality, I think this book feels a lot like Part 2 of The Girl Who Played With Fire. It wasn't a different story, just a continuation and further complexity of a story the other book set up. That being said, I worried about it when I was about halfway through, it just seemed like the same plotline had drug on without any conclusion.
Therefore it felt like a really long wait to get any answers. But in the end, I think it was worth it. I think, without spoiling anything, Annika and Niedermann both stood out as supporting characters with scenes I felt were vital to the end of the book. I was also glad to see some correlation back to the SL of the first book, even if it was brief, because since the last two were so intertwined, it sometimes felt like the Girl with the Dragon Tattoo was just a story before another bigger story.
All in all, it was my second favorite out of the trilogy. I was glad to see everything come full circle and end as well as it could.