No mans Nightingale by Ruth Rendell

A female vicar named Sarah Hussein is discovered strangled in her Kingsmarkham vicarage. Maxine, the gossipy cleaning woman who discovers her body, happens to also be in the employ of retired Chief Inspector Wexford and his wife. When called on by his old deputy, Detective Inspector Mike Burden, Wexford, intrigued by the unusual circumstances of the murder, leaps at the chance to tag along with the investigators.

A single mother to a teenage girl, Hussein was a woman working in a male-dominated profession. Moreover, she was of mixed race and worked to modernize the church. Could racism or sexism have played a factor in her murder?

As Wexford searches the Vicars house, he sees a book on her bedside table. Inside the book is a letter serving as a bookmark. Without thinking much, Wexford puts it into his pocket. Wexford soon realizes he has made a grave error in removing a piece of valuable evidence from the scene without telling anybody. Yet what he finds inside begins to illuminate the murky past of Hussein. Is there more to her than meets the eye?