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J.K. Rowling, the celebrated author of the Harry Potter series, is embarking on a new literary adventure. She's agreed with Little, Brown to publish her first novel for adults, MSNBC reported yesterday.

The juicy bits -- title, release date and the size of her advance -- were not immediately forthcoming. Little, Brown wouldn't even say if they'd paid an advance, much less how much it was.

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The Harry Potter series sold 450 million copies, give or take, and the franchise is worth upward of $15 billion, according to MSNBC.

"Although I've enjoyed writing it every bit as much, my next book will be very different to the Harry Potter series," Rowling said in a statement.

Rowling's agent went straight to the publisher to negotiate, rather than auctioning off the world English rights, according to The Wall Street Journal.

J.K. Rowling's previous publishers, Scholastic in the U.S. and Bloomsbury in the U.K., were "most likely currently weeping tears of sorrow over Rowling's decision," Slate reported.

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