It seems like you're referring to "The Girl in the Spider's Web," which is a novel by David Lagercrantz, continuing the popular Millennium series created by the late Swedish author Stieg Larsson. The series originally started with "The Girl with the Dragon Tattoo."
In "The Girl in the Spider's Web," the story revolves around the complex and enigmatic character, Lisbeth Salander, and the journalist Mikael Blomkvist. While trying to expose corruption and crime in high places, they become embroiled in a web of espionage, cybercrime, and government conspiracies.
The plot is full of suspense, hacking, and intrigue, and it delves into Lisbeth Salander's troubled past and her exceptional hacking abilities. Together with Mikael, she fights against powerful adversaries while unearthing dark secrets.