It will be written by Robert Harris, the screenwriter of The Ghost Writer and author of The Ghost, on which it was based.
Assayas, writer and director of Clouds of Sils Maria and Personal Shopper, will script the film, while Polanski will direct, according to AlloCine.
Roman Polanski and Olivier Assayas are teaming up to make an adaptation of Based on a True Story, Delphine de Vigan’s novel about a writer struggling to complete a new book after suffering the unwanted attentions of an obsessive fan.
De Vigan, a bestselling author in France, has described the story as one that questions the reader’s relationship with fiction.