Truck driver Erika catches transmigrant Idy jumping from hiding in her truck. The confrontation that follows escalates to such an extent that Erika has no choice but to save Idy's life and take him back on board very reluctantly. Since Idy was injured in his foot, and she feels some responsibility for it, they have to rely on each other during their trip to southern Spain. Aller / Retour is a warm buddy road movie about the unexpected friendship of these 2 lonely people looking for their place in this globalized world.