On a 1940 France, just before the great invasion, Eliane is a pharmacist who is married to a dull professor, Henri and has a teenage daughter, Justine. She is an attractive woman but has let her passion fall dormant. One evening, the pharmacy clerk Armand makes a pass at her when he thinks she is Juliette, another employee. Soon she lets the passion overtake her and she begins an affair with him. But he soon starts making ever-growing demands to her, forcing her to have sex under the pharmacy counter and undress in front of a female employee of the pharmacy (who is also having an affair with him), among others demands, effectively turning her into his sex slave. When she finally let herself admit her submission to him, he demands her teenage daughter to prove she'd do anything for him.