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Stieg Larsson, seen in 1998, died of a heart attack in 2004 before any of the books in the popular Millennium Trilogy were published. ((Jan Collsioo/Scanpix Sweden/Associated Press))

The family of late Swedish crime writer Stieg Larsson have confirmed the existence of another manuscript.

Larsson is the bestselling author of The Millenium Trilogy, which includesThe Girl with the Dragon Tattoo, The Girl Who Played with Fire and The Girl Who Kicked the Hornet's Nest.

The writer died of a heart attack in 2004 at age 50 and did not live to see his books become publishing blockbusters and acclaimed movies.

Now his brother, Joakim, has told an American TV show that a manuscript exists for a continuation of the crime series, only it's not book No. 4.

"I got the email from Stieg 10 days before he died where he wrote, 'Book No. 4 is nearly finished,'" recounted Joakim to the CBS show Sunday Morning.

"To make it more complicated, this book No. 4, that's book No. 5, because he thought that was more fun to write than book No. 4."

Joakim said he and his father will not allow the unfinished manuscript to be sold.

It is reportedly to be in the hands of Eva Gabrielsson, Larsson's longtime partner, who lost control of her boyfriend's estate to his father when he died. Swedish law does not recognize common-law marriages.

The two sides are locked in a dispute over profits and control of Stieg Larsson's estate. Talks broke down in June.

According to Larsson's family, Gabrielsson has turned down offers of up to $2.5 million of the books' proceeds. Gabrielsson said the family broke off talks "unilaterally."

The Millennium Trilogy has sold more than 27 million copies worldwide in 44 languages. A Hollywood version of the Swedish movies is in the works with Daniel Craig and Rooney Mara starring in the main roles.