Keeker (Spencer Tracy Spencer Tracy) is a very knowledgeable scientist who devotes his whole life to exploring the good and evil secrets of human nature, and eventually creates a terrible potion that can make Keeker incarnate into Mr. Hyde. Keeker projects all his malice and bad thoughts into Hyde's brain. During the day, Keeker practiced medicine to save people, and when night fell, Mr. Hyde would show up and kill himself. Keeker has a fiancee named Eve (Ingrid Bergman Ingrid Bergman), the relationship between the two is very close, however, Mr. Hyde's presence makes Kickel unconsciously attracted to a dissolute prostitute named Beatrice (Lana Turner Lana Turner). Keeker felt a great deal of pain from his divided personality, and he wanted to destroy Mr. Hyde.
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