A Fourth "Girl Who" Thriller by Stieg Larsson?

We can't resist the word "mystery" in the title of a news item, especially when that title reads "Stieg Larsson's 4th Manuscript Clouded in Mystery." A fourth manuscript?

The late Stieg Larsson is the author of the wildly popular trilogy of thrillers featuring journalist Mikael Blomkvist and computer hacker Lisbeth Salander. But as the Associated Press is reporting, a nearly completed fourth novel with the pair was found on Larsson's laptop.

"The plot is set 120 kilometers north of Sachs Harbour, at Banks Island in the month of September," Larsson wrote, about a month before his death, in an e-mail to his friend John-Henri Holmberg, who made it available to The Associated Press. "According to the synopsis it should be 440 pages." Holmberg doesn't know anything about the plot, but points out that Larsson's long-time partner Eva Gabrielsson is also aware of the unfinished novel, and probably has access to any outline made by the author before his death. For now, Swedish publisher Norstedts doesn't want to comment on the possibility of a fourth book.

The three existing titles in the series are The Girl with the Dragon Tattoo, The Girl Who Played with Fire, and The Girl Who Kicked the Hornet's Nest.