At the Central Park Zoo in New York City, Serbian-born fashion illustrator Irena Dubrovna (Simone Simon) makes sketches of a black panther. She catches the attention of marine engineer Oliver Reed (Kent Smith), who strikes up a conversation. Irena invites him to her apartment for tea. At her apartment, Oliver is intrigued by a statue of a medieval warrior on horseback impaling a large cat with his sword. Irena informs Oliver that the figure is Emperor Jovan Nenad and that the cat represents evil. According to legend, long ago, the Christian residents of her home village gradually turned to witchcraft and Theistic Satanism after being enslaved by the Mamluk. When King John drove the Mameluks out and saw what the villagers had become, he had them killed. However, "the wisest and the most wicked" escaped into the mountains. Oliver is dismissive of the legend even though Irena clearly takes it seriously.