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.
as Lydia Martha
as Luce Arnel
as Comisario Luna
as Inspector Revel
as Florencio
as Rogelio
as Locutor Radio Madrid
as Profesor Visconti
as Abuelo
as Sr. Adrián
as Jefe de policía
as Director de emisora de radio
as Profesor de música
as Comisario Luna
as (no acreditado)
