Juan Carlos Thorry is a police inspector who must solve the mystery of the death of the warden of a boarding school for young women, for which he goes undercover as a music teacher. The main suspect is the mischievous schoolgirl María Duval. A series of entanglements leads the protagonists to becoming romantically involved and to finding the culprit.
| Writing | Edoardo Anton | Writer |
| Editing | Nicolás Proserpio | Editor |
| Art | Ralph Pappier | Production Design |
| Writing | Ariel Cortazzo | Writer |
| Sound | Ramón Ator | Sound |
| Production | Miguel Machinandiarena | Producer |
| Directing | Carlos Schlieper | Director |
| Camera | Bob Roberts | Director of Photography |
| Directing | Vlasta Lah | Assistant Director |