The 28-year-old director, actor, and author said she hasn’t yet talked about the project publicly.
"This is actually my first time talking about it publicly," Dunham told writer and author Ariel Levy during the event. "I'm very excited about it. I'm not sure when it'll happen, but I'm in the process of [working on it]."
Lena Dunham at the New Yorker Festival on Oct. 10.
Thos Robinson / Getty Images for The New Yorker
The "Girls" showrunner described the book as "a girl in 1290 who gets her period and her father basically says, 'Well, it's time for you to get married,' and she's like 'Uh, no.'"
She added, "But it's hyper realistic and really pretty and it's full of incest and beatings but it's a child's story. I've been obsessed with it since I was a kid."
Clarion Books
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Lena Dunham Is Planning On Turning YA Book "Catherine, Called Birdy" Into A Movie