Sickan, the leader of the criminal Jönsson gang is incarcerated in a mental institution, attended by Dr M.A. Busé, who admire a handbook in crime that Sickan has been writing. Blackmailed by the nefarious banker Wall-Enberg, Dr Busé and Sickan's partners Vanheden and Dynamite-Harry execute Sickan's plan of stealing the valuable Black Diamond of the Romanovs from the National Museum.
Andreas, a man struggling with the recent demise of his marriage and his own emotional isolation, befriends a married couple also in the midst of psychological turmoil. In turn he meets Anna, who is grieving the recent deaths of her husband and son. She appears zealous in her faith and steadfast in her search for truth, but gradually her delusions surface. Andreas and Anna pursue a love affair, but he is unable to overcome his feelings of deep humiliation and remains disconnected. Meanwhile, the island community is victimized by an unknown person committing acts of animal cruelty.
A woman is driving alone one evening, when she almost run over a man lying in the road. She gets out of the car to see. Suddenly the man attacks her. Eva Jansson's dead body is found by a local farmer, who calls the police. Soon after fashion designer Maj Berg comes driving the same road and is stopped by the police. When the road is cleared for traffic Mrs. Berg drives on but happens to get a flat tire. While changing to the spare wheel, she finds a black notebook in the ditch. Back in Stockholm she opens the notebook and finds a strange jotting that concerns her.
Based on the play by August Strindberg, Miss Julie vividly depicts the battle of the sexes and classes that ensues when Julie, a wealthy businessman's daughter, falls for Jean, her father's bitter servant.