In a boarding house in the inner city lives Flora - a fresh Copenhagen girl with a burning dream: She wants to be a journalist. Accompanied by loud gramophone music, the typewriter clatters far into the night. But it is not easy to sell stories to the busy press, and Flora has only one last idea that can secure the rent: An interview with shipowner Olivarius, who has bought a precious Chinese statuette. But nothing goes as Flora expects, and soon she is on the hunt for a dramatic robbery story and - not least - in love with the suspected thief!

At the Central Theatre in the chorus girls' cloakroom, the girls have a very lively discussion: The ever-recurring topic - their various male acquaintances. The only one who doesn't join in the joke is the pretty Mette Madsen. She thinks her friends are frivolous and stupid. Oda Holm, who is a very pretty girl, full of sex appeal, claims that Mette, who is also an excellent chairwoman of the chorus girls' organization, is completely devoid of "Oomph". She is incapable of exerting any attraction on men. It becomes too much for Mette.

Eight old school friends meet at Tove's to discuss what has happened in the last 10 years. Some have made careers, others have become homemakers, some are married and others alone. The community is intact, but what no one knows is that Tove is hiding a big, unhappy secret.

The action begins one early summer morning in a hostel, where we see, among others, two young girls, a law student, Ruth, and a small office lady, Ilse. From their conversation, we understand that Ilse has a very bourgeois outlook on life. By chance, these two girls come across one of Ruth's fellow students, Pontus Berthelsen, who is spending the summer holidays in a fisherman's cabin. Ilse, who has little world experience, quickly takes an interest in Pontus, who possesses a lot of innate charm. Pontus does his best to conquer Ilse, but her bourgeois attitude means - at first - that she does not fall for his rather deft approaches.

A woman is found strangled in her shop. Shortly after, another murder is committed. Perhaps the most terrifying is that the both girls' name is Sonja. The police is convinced it's the same killer and at each scene is heard a woman singing the same song. A song which is soon dubbed the 'murder melody.'