Hete septemberdager Jan 26, 1959

Alexis is celebrating his 25th anniversary as a bachelor, having never married but instead drifting through life and taking relationships and women as they came his way. Right now, he is in a relationship with a young student, the daughter of a classmate celebrating his 25th anniversary. It is the young girl Susann who is captivated by his charming gray hair. Turi is also celebrating her 25th anniversary and is Alexis' old flame and classmate, recently returned home from America after a failed marriage. The meeting between Turi and Alexis rekindles old love. During the days of September, Alexis is faced with the choice between his young and cheerful Susann and his great love from his school days. Merchant Lindby, Susann's father, also comes to Oslo to celebrate. He is celebrating his anniversary together with Turi and Alexis.