'' Marguerite & Julien '' ( ) is a 2015 French drama film directed by Valérie Donzelli about a brother and sister involved in an incestuous relationship . The film is based on a 1970s screenplay written by Jean Gruault for François Truffaut , which in turn is based on the true story of aristocratic siblings Marguerite and Julien de Ravalet who were executed in the 17th century on charges of incest and adultery . It was selected to compete for the Palme d'Or at the 2015 Cannes Film Festival
2015 Cannes Film Festival
2015 Cannes Film Festival
Marguerite & Julien