The Keys To The Street by Ruth Rendell
This novel weaves a suspenseful tale set against the backdrop of London's Regent's Park, where the lives of the affluent and the homeless intersect with deadly consequences. The story follows Mary Jago, who donates bone marrow to save the life of a stranger, thereby escaping her abusive relationship. However, her act of kindness inadvertently draws her into a web of murder, deceit, and danger. As a series of brutal murders terrorize the park's inhabitants, Mary finds herself deeply entangled in a mystery that forces her to confront her own fears and secrets. The narrative masterfully explores themes of social inequality, redemption, and the complex nature of human relationships, all while keeping the reader on the edge of their seat with its gripping suspense and unexpected twists.