"The Girl with the Dragon Tattoo" by Stieg Larsson. This was a great read if you like a mystery.... it is a bit gorry and some parts were very disturbing ~ so be warned (overall nothing you wouldn't see during prime time TV). I hear they are making it into a movie again, it would make a great movie in my opinion.
There is a lot to the storyline and I wouldn't know how to go about telling it... so.... there is a great synopsis HERE on wikipedia.
I will be looking for the next one in the series.... "The Girl Who Played With Fire".