Sylvain Runberg 
Girl Who Played With Fire #1 [PDF ebook] 

Following a fall from grace, discredited journalist Mikael Blomkvist opted to take up a missing persons case. His investigation led him to a mysterious computer hacker, Lisbeth Salander, who is hell-bent on revenge against her legal guardian. After solving the case together, Salander helped Blomkvist to publish an expose in the Millennium, restoring his reputation. Realizing her affections for him were unrequited, Salander subsequently disappeared. But a year has passed, and Salander is back in Stockholm just as Blomkvist is on the brink of a major story…