Sacha, who is 15, comes to live with her father, a stranger to her whom she hardly knows and whom she has not seen for years. Neither he nor she is happy with this situation, but that's how it is. To protest against this decision taken for her by adults, Sacha shaves his head and runs away from home.
That's why Maxime and a girl nicknamed "The Mouse" mistake Sacha for a boy. Suddenly the young girl has the opportunity to enter the world of young people her age, a new world, fascinating but sometimes dangerous. Sacha pretends to be someone else without realizing how far this will take him.
