A brilliant high school senior girl is quite taken with the science of behavioral modification. When her father suffers a stroke, she experiments with her own family, turning her home into a laboratory, unbeknownst to her teachers and neighbors who have only the highest regard for her. It isn't until a teacher becomes suspicious that her terror is exposed....

Young Leon and Ursula had little except each other. Mother was driven by a psychotic need to clean--constantly--everything in sight. Father was consumed by his medical practice and an analytical approach to life. But he understood the sensual hunger growing inside his children's young bodies. He knew they could help each other answer, "The Need." Father had Science. Father had Reason. And he had Pin.
Pin who answered all the children's questions in a voice not unlike the doctor's. Father's clever trick. Father's brilliant illusion. But then there was the accident and Mother and the doctor...