Philippe Marcillac grew up in Sète, where he specialized in pranks of dubious taste. One day, as a teenager, he organizes a party in an abandoned villa. Philipe finds himself alone with Marie-Titite, who advises him to restart his life on a more serious footing.

June 1940, near Saumur. During the exodus, the bridges having been destroyed, a group of refugees, brought together by the chance of fleeing the advancing German troops, build a raft to cross the Loire to evacuate a sick little girl.