Jenny Lowe, a primatologist studying chimpanzees, is running for her life with the child of a murdered fellow scientist after a civil war explodes. Jenny grabbing the notebooks of the primatologist who's been killed. She brings the girl to Chicago to await the discovery of her relatives. The girl is fifteen and lovely, her name is Lucy. Realizing that the child has no living relatives, Jenny begins to care for her as her own. When she reads the notebooks written by Lucy's father, she discovers that the adorable, lovely, magical Lucy is the result of an experiment. She is part human, part ape, a hybrid human being.