In Barcelona, a young girl hides and looks out of the window. As the city is besieged by bombs and soldiers, she prepares to flee. In a small mountain village, a mysterious person is waiting for her to help her get to France. During a journey of a few days, they walk through the border area and meet some of its inhabitants. From the top of the invisible line between two countries, she sees the world that she is leaving behind to descend into the unknown.