Stranger ThingsstarMillie Bobby Brownand her sisterPaige Brownare teaming with Netflix on the cancer dramaA Time Lost, Collider has confirmed.

Anna Klassen(When Lightning Strikes) has been tapped to write the screenplay, based on an original idea by the Brown sisters. Millie will produce under her PCMA Productions banner, while Paige and her fatherRobert Brownwill serve as executive producers.

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The story follows a long-standing feud between two Long Island families that comes to a head when one of their teenage daughters is diagnosed with cancer. At this time, theStranger Thingsactress is only attached to produceA Time Lost, though it’s also conceivable that she could star should the project come together with the right director.

“We are so grateful to Netflix for their confidence in us and this beautiful story, which we have spent years writing and developing. It’s about friendship, family and overcoming obstacles when it feels like the world is pushing you down. It’s been a labor of love, literally," the Brown sisters said in a joint statement.

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“Millie is an extraordinary creative talent. We’ve been lucky to have her in our family from the beginning of her career. It is a genuine thrill to witness Millie bring her distinct vision to the screen, now as a writer and producer, alongside her sister on this wonderful film," said Netflix’sLisa Nishimura.

Brown recently starred inGodzilla: King of the Monsters, and she’ll be back forAdam Wingard’sGodzilla vs. Kongnext year. She has also wrapped Legendary’sEnola Holmesmovie, in which she stars oppositeHenry Cavill’s Sherlock Holmes.

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Klassen is already in business in Netflix, which is developingDorothy and Alice, in which the heroines fromThe Wizard of OzandAlice in Wonderlandare sent to a home for ‘troubled’ youths. She previously wrote theJ.K. RowlingbiopicWhen Lightning Strikes, which was voted to the Black List. WME represents Brown and Klassen, who is also repped by Writ Large.