Polanski 's '' Based on a True Story '' is an adaptation of the French novel by bestselling author Delphine de Vignan . The film follows a writer ( Emmanuelle Seigner ) struggling to complete a new novel , while followed by an obsessed fan ( Eva Green ) . It started production in November 2016 from a script adapted by Polanski and Olivier Assayas . It premiered out of competition at the 2017 Cannes Film Festival on 27 May 2017 and opened in France on 1 November 2017
2017 Cannes Film Festival
2017 Cannes Film Festival
Roman Polanski