Film nineteen of the festival and Marie Kreutzer's Gentle Monster is one of the bravest films at Cannes this year. Léa Seydoux discovers her husband is a pedophile and the film watches her decide what to do with that knowledge, one unbearable detail at a time. We talk about Seydoux's implosive performance, Kreutzer's personal connection to the material, and why this film refuses every easy exit. More from day four still to come.