Olympe (Louise Monot) is a French high school student, trying to fit in, have a boyfriend, etc. When word gets out that her mother Martine (Élisabeth Bourgine) is a lesbian, and she's teased at school, Olympe doesn't react well. She sulks with her mother and insults her boyfriend. Martine's lover Do (Donatienne Dupont), who lives with them, is supportive, but also has issues with how far in the closet Martine is.

Olympe runs off to Paris to stay with her father, who also happens to be gay, but she doesn't seem to have such a problem with her father or her father's lover. While in Paris, she sneaks out to a lesbian bar just to look around. Lots of questions, but a mother who just doesn't talk with her very much could be part of the problem.

She wants to live with her father, but he drives Olympe back home. When she arrives early, she walks in on her mother and Do making love, prompting her to tell her mother to get rid of "the filthy dyke." She forces her mother to choose between daughter and lover, so Do moves out.

Mother and daughter do become closer, but the problems at school just continue. Finally, Olympe pulls a disappearing act, and when Do saves her from a problem situation, she finally comes to her senses. In the end, both mother and daughter have grown, and Olympa is back to a normal high school life with a boyfriend who cares about her.