 Sture is a rich alcoholic who has taken a trip to Mallorca to drink himself to death. But he meets Sylvia and they start a relationship. Sture moves in with her in a middle-class community. Sylvia has an eighteen year old daughter, Eva. She gets murdered on the night between Midsummer eve and Midsummer day, and the police s suspicions fall on Sture, who was so intoxicated that he can not say what he was doing during the night.