Simisola: (A Wexford Case) by Ruth Rendell
The sixteenth book to feature the classic crime-solving detective, Chief Inspector Wexford. When a young, black woman goes missing in Kingsmarkham, Wexford must respond to a test not only of his powers of deduction, but of his basic beliefs and prejudices. Only eighteen black people live in Kingsmarkham. One of them is Wexford's new doctor, Raymond Akande. When the doctor's daughter, Melanie, goes missing, the Chief Inspector takes more than just a professional interest in the case. Melanie, just down from university but unable to find a job, disappeared somewhere between the Benefit Office and the bus stop. Or at least no one saw her get on the bus when it came... When the body of a young black woman is discovered, Wexford must overcome his underlying prejudices to allow his investigative skills to succeed.