Anne Greguen is one of those teachers who cares a lot about her students' problems. In 'Once in a Lifetime', based on real events, we see how she gets a pretty tough class. She's determined to show her students how lucky they are, so she signs them in a national contest about teenagers living in Nazi concentration camps. A team effort that will make a strong bond between the teacher and her students, and that will change them forever. Marie-Castille Mention-Schaar directs 'Once in a Lifetime', starring Ariane Ascaride.