The Ruth Rendell Mysteries (1987) : 5x4

Wexford is staying in London with his nephew Howard, a police superintendent, convalescing from over-work and under doctor's orders to drink only water. He is supposed to be resting, but he is bored, and his nephew is dealing with a fascinating murder case. The body of a young woman, Loveday Morgan, was found in Kenbourne Vale Cemetery, strangled with a silk scarf, and the only things in her handbag were a photograph and two telephone numbers. It appears that she had no money and was living under a false name. Wexford, keen to get out and about, is drawn to the case. His unofficial investigation uncovers a story of adoption and parental love.