Cannes film festival: The Son of Saul director’s dramatisation of Jean Moulin’s torture by Klaus Barbie both benefits and suffers from its mainstream approach Cannes film festival: The Son of Saul director’s dramatisation of Jean Moulin’s torture by Klaus Barbie both benefits and suffers from its mainstream approach L ászló Nemes made his Cannes debut 11 years ago with the terrifying, Oscar-winning Holocaust drama Son of Saul , and followed that up with Sunset , his elegant, mysterious drama of