Although Stieg Larsson died in 2004 with only three books in his double Gold Key Award winning series finished, his characters Lisbeth Salander and Mikael Blomkvist continue on in this follow-on novel, written by Swedish crime journalist and novelist David Lagercrantz at the request of Larsson's estate. A mysterious source contacts Blomkvist, claiming to have information vital to the United States from a young female superhacker—perhaps someone he knows all too well. The implications are staggering, and Blomkvist, in desperate need of a scoop for Millennium, turns to Salander for help. She, as usual, has her own agenda—one that could get them both killed.