Indetectable

Wanda Wary, a black orphan, is a senior in a newly-integrated rural Kansas high school in 1955. She is a student on weekday mornings. A work/study program has her working as a nurse's aid in an rest home during the afternoons.
Jack Jameson, a quadriplegic patient, joins her in a firm which is merely a yellow-page listing for INDETECTABLE PRIVATE INVESTIGATIONS with a P.O. Box and Jack's telephone number.
To their surprise, their first case is a violent rape of a woman who doesn't want law enforcement involved.