The Girl Who Lived Twice (Millennium, #6) by David Lagercrantz

The sixth and final book in the Millennium Series follows Lisbeth Salander as she prepares for a final showdown with her most dangerous enemy—her twin sister, Camilla. While Salander disappears into the shadows, Mikael Blomkvist investigates the mysterious death of a homeless man who was obsessed with Sweden’s Defense Minister. His search uncovers a web of political corruption, Russian intelligence, and deadly secrets. Meanwhile, Salander is forced to confront her past as she tracks down Camilla, leading to a high-stakes confrontation that could change her life forever. With cyber warfare, espionage, and personal vendettas colliding, this fast-paced thriller brings Salander’s story to a dramatic and action-packed conclusion.