This time, Gil Alma and Benoît Joubert are taking a trip from the hills of Gascony to the Spanish border. To get around, they will alternate between walking, cycling and carpooling. They will take the opportunity to lend a hand to Florence and her team of volunteers involved in cleaning the banks of the Garonne. The two accomplices will also visit the village of Melles, which aims for self-sufficiency, in the company of Alban, the dynamic mayor of the town. Finally, they lend a hand to Chloé, one of the very few paper artisans in France.