The 跨越凜冬plot centres on forty-something Marie, who lives in the Hautes-Alpes department of France, cut off from her close family. All she has is her lover, Alex, who works in the border police force. Thanks to him, she traffics cigarettes between Italy and France to make ends meet. One day, on her way to France, she runs into Mouneer, a 20-year-old Sudanese migrant, who is determined to catch up with his little sister. He works out that she is a trafficker and persuades her to get some migrants across the border.