In modern day Mexico, a man on the street is supernaturally killed after hearing the eerie sound of a wailing woman. We then arrive at the manor of an upper class family, who are celebrating their young son’s birthday. A mysterious cloaked figure is eavesdropping on them, taking advantage of secret rooms and passages. Eventually, the intruder (who appears to be possesessed) kidnaps and attempts to murder the boy at a pagan altar using a sacrificial knife and stone.