Chloe Grace Moretz has been roped in as the lead in Brain on Fire.READ: Dakota Fanning 'loved' fake baby bump The 22-year-old
Kick-Ass 2 actor will replace
Dakota Fanning in the film, said The Hollywood Reporter.
An adaption of Susannah Cahalan's memoir, the film will be produced by
Charlize Theron.
The memoir follows attempts by doctors to diagnose what's wrong with Cahalan - eventually discovering she has a new and undiscovered autoimmune disease.
Moretz is co-starring with her
Brain on Fire producer Theron in the adaption of Gillian Flynn's second novel,
Dark Places.
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WATCH: Kick-Ass 2 Official Theatrical Trailer #2 (2013) - Chloe Moretz Movie HD