Adam Markovitz
July 23, 2009 AT 01:40 PM EDT

Despite reports that author Frank Miller (300, Sin City) recently finished a draft of a follow-up to his 1999 graphic novel, 300, Miller’s agent tells EW: “He’s working on it but he’s not nearly finished, and I would know, because if he did I would run over and grab a check.”

The book could be the basis for a sequel — or prequel — to the 2007 hit film, which grossed $456 million worldwide. Star Gerard Butler and director Zack Snyder are not officially attached to the new movie at this point. –Additional reporting by Leah Greenblatt

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