At its core, Ek Haseena Thi Ek Deewana Tha is an attempt to revive the "musical thriller" genre—a staple of Indian cinema popularized in the 1960s and 70s. The film follows a classic trope: a young woman (played by Shivshakti Sachdev) travels to an ancestral estate, only to find herself entangled in a supernatural romance with a mysterious figure (Upen Patel). The narrative explores several key thematic pillars: