Agents across the globe take turns spying on and double-crossing one another in an attempt to locate a valuable formula encrypted in the music code.
Antonio Mayans
Lina Romay
Howard Vernon
Juan Soler
Ángel Ordiales
Eugenia Farach
Juana de la Morena
Daniel Katz
Mari Carmen Nieto
Antonio Rebollo
Verónica Arezchavaleta
Ramón García
Miguel Casanova
Jesús Franco
José Llamas
