A university professor (Gosta Ekman) and his wife (Adriana Asti) hire a young man (Lars Ekborg) to help the professor arrange his papers for publication. The young man comes to live with the couple and leaves his mistress (Agneta Ekmanner) to take the position. The young man discovers very quickly that things are not quite right with the dysfunctional duo. He suspects the wife of trying to poison the professor, who mistreats and degrades his wife by humiliating her in front of the young man. The wife and the young man end up having sex while the professor goes after the young man's mistress. Soon the men swap partners and the blur between reality and fantasy continues in this erotic and confusing feature.