The film, based on a script by Nick Yarborough, portrays the story of John F. Kennedy's troubled older sister who was kept from public view and was eventually institutionalised, reports hollywoodreporter.com.
"The movies about the Kennedy family are deservedly stormy affairs, but here's a story about the storms within all of us. This is why I am excited to tell this story, and to collaborate with Elisabeth, a fabulously talented actor," Batra said in a statement.
Rose Marie aka Rosemary, the daughter of Joseph Kennedy Sr and Rose Fitzgerald, showed signs of mental disability that the family kept hidden.
When she was 23, Rosemary was one of the first people to receive a prefrontal lobotomy, but its failure left her permanently incapacitated.
The project will be unveiled to foreign buyers at the Berlin International Film Festival.
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