Post Tenebras Lux focuses on an adventurous and affluent young couple whose lifestyles have changed from being carefree swingers in Europe to the frustrated parents living in a somewhat secluded ranch in Mexico. With its interlacing perspectives, non-chronological narrative and use of demons (both literal and figurative), it's a film that will not only challenge audiences but also tempt and taunt viewers with its defiance of a single interpretation.