I intensely devoured this book in a couple of days, riveted by the mystery of the 1966 disappearance of Harriet Vanger. As in all great stories, this had interweaving of multiple plot points to keep your interest:
* Millenium magazine, founded by Blomkvist and Berger (occasional lovers), headed for financial trouble after Blomkvist indicted for libel after publishing a story about financial thug Wennerstrom.
* Henrik Vanger, old industrial tycoon, hires Blomkvist to write his family history to disguise the true nature of his assignment: to discover who killed Harriet Vanger, his niece, back in 1966.
* Lisbeth Salander, the goth hacker with photographic memory, subjected to horrors by her state guardian but who knows how to extract payback.