Michèle, homeless, lives at Orly airport, wandering between the different halls. She regularly meets Théo, a young sweeper at the airport. Suffering from a mental handicap, he lives with his "Aunty" who overprotects him. One day, Michèle makes a most unexpected discovery, which leads her to convince Theo to drive her in his license-free car to Lisbon to find her son. They then embark on a road trip full of twists and turns on departmental roads.