With the complicity of Kim Pasche, two French-speaking families go to the North-West of Canada and immerse themselves in a wild nature close to that of Switzerland at the time of prehistory - 8,000 years ago. The families from Cottens (VD) and La Chaux-de-fonds (NE) experience an astonishing return to their roots, carried by the grandiose landscapes of the Yukon, and go through a masterful adventure