In Bangui, the capital of the Central African Republic, 17-year-old Robert dreams of a career in music, but a civil war is tearing his country apart. Vénéranda, a survivor of a genocide against the Tutsi in Rwanda, is helping victims and perpetrators talk to each other—to rebuild lives as well as the country. In a war-torn Yemeni village, Layal runs a women-only gas station where she shelters her brother from militias that are forcibly enlisting boys above 12 years.Robert, Vénéranda and Layal are all protagonists of movies at this year’s Cannes Film Festival where the official selection is packed with...