|Jane Fonda||Dr. Martha Livingston|
|Meg Tilly||Sister Agnes|
|Anne Bancroft||Mother Miriam Ruth|
|Anne Pitoniak||Dr. Livingston's Mother|
|Winston Rekert||Detective Langevin|
|Gratien Gélinas||Father Martineau|
Dr. Martha Livingston is a court-appointed psychiatrist sent to evaluate Sister Agnes, a young nun whose infant has been found strangled. With Agnes claiming a virgin conception and having no memory of giving birth, Livingston must distinguish between the lies and the nun's perception-altering faith. Complicating her investigation, Livingston continually clashes with the overbearing Mother Miriam Ruth, who insists that Livingston leave Agnes alone.