The Penguin Pool Murder

Gwen Parker (Mae Clarke) meets her former boyfriend Philip Seymour (Donald Cook (actor)) at the local aquarium and asks him for some money so she can leave her husband, stockbroker Gerald Parker. However, Mr. Parker receives an anonymous telephone call tipping him off to the rendezvous. When he confronts the pair, Seymour knocks him out with a punch. As there are no witnesses to the altercation, he hides the unconscious man in the room behind an exhibit.