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'.
| Directing | Bodil Ipsen | Director |
| Writing | Fleming Lynge | Writer |
| Writing | Tavs Neiiendam | Story |
| Sound | Erik Fiehn | Music |
| Crew | Valdemar Christensen | Cinematography |
| Editing | Valdemar Christensen | Editor |
| Editing | Carl H. Petersen | Editor |
| Art | Max Louw | Production Design |
| Costume & Make-Up | Inger Bjarne | Costume Design |
| Sound | Henning O. Petersen | Sound |
