Burke and Hare murders doctors, the Burkes and Hares were charged with murder. As part of his investigation Christison interviewed Knox, who asserted that Burke and Hare had watched poor lodging houses in Edinburgh and purchased bodies before anyone claimed them for burial. Christison thought Knox was "deficient in principle and heart", but did not think he had broken the law. Although the police were sure murder had taken place, and that at least one of the four was guilty, they were uncertain whether they could secure a conviction. Police also suspected there had been other murders committed, but the lack of bodies hampered
Murders in the Zoo for comfort…[and judging] by its ability to chill and terrify, this film is a successful melodrama." Mark Clark wrote an article on Lionel Atwill as an actor and says that "Murders in the Zoo" was the "quintessential Lionel Atwill film." In the article Clark claims that "Atwill performs here with the quiet, coiled striking power of a beast tracking its prey. He glides effortlessly across the screen, speaking volumes with a barely perceptible change in tenor in his voice, unveiling his character's hidden passions with a simple, unguarded glance." Murders in the Zoo Murders in the Zoo is 1933 Pre-Code