Every day, three sex workers cross the border from France into Belgium to practice their trade. At the end of one particularly hot summer, all three share a secret that will bind them together forever.

Working Girls tells the story of three women, Axelle (Sara Forestier), Conso (Annabelle Lengronne) and Dominique (Noémie Lvovsky), who have nothing in common except that they are colleagues and cross the border together every day to go to work. To live decently on one side of the border, in Roubaix, they prostitute themselves on the other side, in Belgium. At the end of one particularly hot summer, all three share a secret that will bind them together forever.