In 1946, the restless ballet dancer Rut accompanied her husband Bertil to return to Sweden after an academic visit around Italy. They quarreled with the train in a hotel room in Basel, a northwestern Swiss city on the banks of the Rhine, and threw food to hungry German refugees outside the window. Inadvertently, they heard some witty words from several Swedish priests about marriage, and eventually the two of them made up again. In terms of film theme, he continues the gender rivalry and doubts about marriage in Bergman's early films. The failure of Rut's relationship with Raoul and the resulting infertility are the dead knot of the relationship network in the show, and her later marriage with her husband Bertil leads to the tragedy of Bertil's former lover Viola, which is like a whirlpool engulfing the passion in life. Bergman divorced his second wife Ellen at that time, and this film can be seen as Bergman's own situation on marriage. Another important point is that "three" is a new attempt of Bergman's early film, which is not driven by the storyline, but with the psychological state of the characters as the internal rhythm of the film.