Dr. Lee, a man of medicine, is consumed by an unholy desire for his sister, a patient at the asylum he oversees. Their love, a twisted dance of familial bonds and carnal lust, unfolds in the shadows of their secluded quarters. She, a willing participant, bares her body to him, her moans of pleasure echoing in the sterile halls. He, a man of science, is ensnared by her allure, his professional ethics crumbling under the weight of their forbidden love. Their secret affair, a dangerous game of cat and mouse, reaches its climax when a fellow doctor stumbles upon their incestuous tryst.