Doctor Beiral, torn apart by the internal struggle between his social persona and the dark instincts that torment him, manages to use his investigations to give life to the monster that he has long held within him.

• Ditirambo Films
• El Deseo
• François-Eric Gendron
• Amparo Larrañaga
• Jean-Claude Adelin
• Elena Bagutta
• Fernando Hilbeck
• Luis G. Gámez
• Ernesto Alterio
• Berta Casals