Det er nat med fru Knudsen

Mrs. Knudsen lives in a run-down apartment in Vesterbro and must not only be dragged here with her little cheater by a son, Arnold, but also his friend Benny. The two young men are astonishingly creative in their shady activities, but as a young woman moves into the stairwell, they throw all their efforts into seducing her. And soon it's night with Mrs. Knudsen.