Stieg Larsson was a Swedish author best known for his Millennium Trilogy, which consists of the novels 'The Girl with the Dragon Tattoo', 'The Girl Who Played with Fire', and 'The Girl Who Kicked the Hornet's Nest'. He wrote the books under the pseudonym Stieg Larsson, which is the answer to the crossword puzzle. Larsson was a journalist and an activist who wrote about right-wing extremism and racism in Sweden. He died in 2004, shortly after delivering the manuscripts for the trilogy to his publisher.