I hate comparing her to MacGyver, but Elisabeth Salander is definitely a digital MacGyver. Unlike other female protagonist that usually start their book by being weak and then training themselves from there, Salander is already an all-around badass with her own moral code and no remorse.
When she is contacted to work with a disgraced journalist to research into the alleged murder of an industrialist granddaughter, she is intrigued enough to give it her all. Read this book and its sequel to discover what Mikael Blomkvist and Lisbeth Salander discover.