Question: What is the name of the movie  directed by Vernon Sewell in 1971 that is based on 16 murders commited over a period of 10 months in1828 in Edinburgh, Scotland?
Sentence (from "Burke and Hare murders"): The killings were undertaken by William Burke and William Hare, who sold the corpses to Doctor Robert Knox for dissection at his anatomy lectures.
Relevant evidence: No