In Paris, Mon­sieur Sli­mani, an old man, wit­ness­es an assas­i­na­tion. Per­sued by the mur­der­ers, he escapes into a mosque. Dis­cov­er­ing, that the mur­der­er is a mighty person, he becomes anx­ious and decides to reteurn to Alge­ria. His sudden depar­ture lets his son, a young jour­nal­ist, become aware of the case, and he won­ders, why his father doesn’t want to give evi­dence…