Archibaldo de la Cruz (Ernesto Alonso) is a wealthy Mexican man. As a privileged child during the Mexican Revolution, he witnessed the death of his governess, who died as she told him a fable about a music box that his mother had just given him. Because of the contents of the story and the coincidental timing of the governess's death, a young Archibaldo concludes that he had killed the woman using the music box. It is from there that his desire to kill begins.