A Senegalese platoon of soldiers from the French Free Army are returned from combat in France and held for a temporary time in a military encampment with barbed wire fences and guard towers in the desert. Among their numbers are Sergeant Diatta, the charismatic leader of the troop who was educated in Paris and has a French wife and child, and Pays, a Senegalese soldier left in a state of shock from the war and concentration camps and who can only speak in guttural screams and grunts.

The TGV? No, it is not the famous French high-speed train, but instead the rickety and colourful bus operated, driven, repaired and, if need be, pushed by the intrepid "Rambo". This time, the trip between Dakar, the capital of Senegal, and Conakry, the capital of Guinea, is outright dangerous: the road crosses the territory of the Bijagos, who have launched an unexpected and violent insurrection. Rambo finds several odd passengers (with a handful of sheep) who are ready, for various legitimate or untold reasons, to take every risk to reach Conakry. And the TGV sets off on an eventful journey...