An old violin maker has been killed and the investigators have only one clue: on the night of the crime, a blind street musician heard a melody playing in the house. As they do not know the title of the song, they present the music to the famous radio contest known as “The Mysterious Melody”. Little by little the two inspectors will surround the killer after checking that there are several suspects.
Mick Micheyl
Lydia Martha
Dany Carrel
Luce Arnel
Manuel Gas
Comisario Luna
Howard Vernon
Inspector Revel
Carlos Otero
Florencio
Manuel Monroy
Rogelio
Bobby Deglané
Locutor Radio Madrid
Ricardo Fusté
Profesor Visconti
