In L'innamorata, Almirante is at the zenith of her career, starring as Mara Flores, a vampish society lady, who casts her eyes on Carlo, an electrical engineer and director of a powerplant. Although attracted to Mara, he rejects her, and she immediately turns around and sinks her fangs in his best friend and future brother-in-law, Franco. Not possessing Carlo's self-composure, Franco takes up with Mara, and it leads him to his ruin and death. Now, Carlo does fall under Mara's spell, and as their passion intensifies, it becomes clear that there will be no happy end to this story.