- The "Harry Potter" author says she has written part of a new book
- Rowling said she also has ideas for more adult novels
(CNN)Take heart, J.K. Rowling fans, she has more coming for you.
The "Harry Potter" author is promoting her latest adult novel, "Career of Evil," which she told the BBC is the only book she's "ever written that has literally given me nightmares."
But while Rowling has recently been focusing on novels for grown-ups, she said she's got something coming for her younger fans.
"I have written part of a children's book that I really love, so there's will be another children's book," she said.
Rowling has built an empire out of her "Harry Potter" series, which spurred an enormously successful movie franchise. She's never far from the Potter universe, as she often posts on her Pottermore site.
She's also got the upcoming "Fantastic Beasts and Where to Find Them" film, a "Potter" spinoff, as well as the "Harry Potter and the Cursed Child" stage production, which is set to premiere at the Palace Theatre in London next summer.
Rowling told the BBC she has more ideas for other adult novels, too.
"I sometimes worry I'll die before I've written them all out," she said. "That's my midlife crisis."