 Marianne is unhappily married with the rich Arvid Croneman. Arvid has been ill for some time and Marianne has looked forward to his death. However, Arvid recovers. Marianne has had an affair with Lennart Haegg, her husbands doctor. She steals poison from his office and makes sure that her husband gets a poisonous injection that swiftly kills him. After his burial, Arvid s relatives, who lives in the house, treats her with suspicion. Has she really gotten rid of all the evidence?