Seldom has a book been hyped to the extend as the Millennium trilogy by Stieg Larsson. I can not say I have been unaffected by this, since I went and bought the books. The first one, The Girls with the Dragon Tattoo was my favourite because of the closed room mystery which was presented. I have a soft spot for those.
It actually took me some time to figure it all out, especially due to quite some red herrings, but the interactions between the two main characters made the wait worth it. Lisbeth is of course the real main character of the series and has become a prototype for the strong female protagonist.