Director Xavier Giannoli explores the darkness and shadows of Nazi occupation

French director Xavier Giannoli's latest film sees Jean Dujardin embody the moral slide from pacifism to collaboration, as the Academy Award-winning actor helms the historical drama "Les Rayons et les Ombres". Film critic Manon Kerjean tells us why the complexity of its characters gives the film a powerful sense of nuance and why – at over three hours long – it's still a compelling watch.