The Deadly Triangle Inspired by "The diabolical" by Clouzot. The life of a woman becomes a sinister nightmare due to the plan drawn up by her husband. Details Casts Posters Title The Deadly Triangle Release Date 1973-12-10 Runtime 01 Hours 22 Minutes Genres Thriller Horror Mystery Production Companies Films Triunfo S.A. Production Countries Spain Erika Blanc... Alice Harris... Vicente Parra... John Harris... Juan Luis Galiardo... Andrés Larson... Ágata Lys... Margot... Ángel Menéndez... ... Maribel Hidalgo... ... Francisco Nieto... ... Carmen Luján... ... Marisol Delgado... ... Ricardo G. Lilló... ... Francisco José La Vega... Niño... Original Size (700x1050) Original Size (700x1050)