Tomboy tells the story of 10-year-old Laure (played by the amazing Zoe Heran) who moves to the suburbs and decides to pass as a boy amongst the pack of neighborhood kids. As "Mikael" she catches the attention of leader of the pack Lisa, who becomes smitten with her. Finding resourceful ways to hide her true self, Laure takes advantage of her new identity, as if the end of the summer would never reveal her unsettling secret.