Along came a spider and sat down beside her...

Written by David Lagercrantz and narrated by Simon Vance
Here again is Lisbeth Salander, hacker, from a sadistic father and yet, heroic and brainy beyond imagination.
She's asked by her old friend Michael Blomkvist to help with a child who is a savant.  He's witnessed a murder, but the killer allows him to live because the killer didn't think he could communicate.
However, the boy had an outstanding ability to draw and Lisbeth brings out his skill -  thus displaying an image of the killer whose boss now wants the boy dead.  (Because he's a witness.)
There are other hackers at work and a mole within the government service.
Blomkvist is trying to write a story about the killers at work including a mysterious woman.
This is one of the most suspenseful books I've I've enjoyed this year.  And Salander is one of the best protagonists.