Jan-Erik Widgren meets the lonely Bertha Olsson, a woman struggling with alcoholism. Though Bertha is already linked to Caligula, Jan-Erik's heartless teacher, she begins a relationship with the boy anyway. When Caligula learns that Jan-Erik is having an affair with Bertha, he begins to torture his student psychologically. He reserves his cruelest behavior for Bertha, however, which results in a tragic turn of events.
Maggi meets David after having missed her train, and they spend the night together. Penniless, the young lovers break into a summer cottage. The owner, Håkansson, offers to rent it to them, but he has an ulterior motive. By living together, they have to face their pasts and deal with the meddling neighbors and authorities.
The film follows a number of people in an apartment building during a night full of dramatic events and entanglements.
