In the Jura Mountains near the Swiss border, in 1940, a small group (still teenagers or young adults) are determined to do something to resist. Their perfect knowledge of their territory and its paths allows them to cross to the other side. Documents, information, but above all denounced resistance fighters, downed airmen, and Jewish families with their children. Hundreds of lives saved at the risk of their own; the extraordinary heroism of these women, the Passeuses.