The "Millennium Trilogy" is a series of three crime novels written by Swedish author Stieg Larsson. The books include "The Girl with the Dragon Tattoo," "The Girl Who Played with Fire," and "The Girl Who Kicked the Hornet's Nest." The series follows journalist Mikael Blomkvist and hacker Lisbeth Salander as they investigate complex cases involving corruption, violence, and social issues in Sweden. Originally published between 2005 and 2007, the trilogy gained international acclaim and has been adapted into films and television series. After Larsson's death, the series was continued by author David Lagercrantz, who wrote additional novels set in the same universe.