Tunis, winter of 1954, the events that follow bring together two intellectuals Brahim and François, they arrive from France and find themselves in the same train that will lead them to phosphate plants in Redeyef, south of Tunisia.
Brahim is a lawyer involved in the national movement which is responsible for finding his brother, leader of the guerrillas to convince him to lay down arms, a necessary condition for negotiations with the French. François is an ethnologist convinced by Pierre Mendes France's policy of changing his method and paving the way for peace. It is in Redeyef, a small mining village in the south-west of Tunisia, that everything happens.—brahamdali