The Millenium series has skyrocketed in popularity and once I read the second one (The girl who liked playing with fire) there was no escape but to read this third one and complete the series. Also, the second book stops abruptly so much so that they include a chapter of the third book just so that you are not left completely hanging.
This book has less action and is more centered around building the case for and against Lisbeth Salander and the Swedish authorities' role in her life. There is a big courtroom drama in the end as well. Overall the book is a quick read, but the trend is definitely downhill. I loved the first book. The second was tolerable and the third was something that I was eager to get done with. If you can only read one book this year, then certainly read the Girl with a Dragon Tattoo. If you plenty of time on your hands, then read 2 & 3 together.