The Girl with the Dragon Tattoo by Stieg Larsson (Millennium #1)

The Industrialist: Henrik Vanger, head of the dynastic Vanger Corp. is tormented by the loss of a child decades earlier and convinced that a member of his family committed murder.
The Journalist: Mikael Blomkvist delves deep into the Vangers' past to uncover the truth behind the unsolved mystery. But someone else wants the past to remain a secret and will go to any lengths to keep it that way.
The girl with the Dragon Tattoo: Lisbeth Salander, the enigmatic, delinquent and dangerous security specialist, assists in the investigation. A genius computer hacker, she tolerates no restrictions placed upon her by individual, society or the law.