Francis, a young man, recalls in his memory the horrible experiences he and his fiancée Jane recently went through. Francis and his friend Alan visit The Cabinet of Dr. Caligari, an exhibit where the mysterious doctor shows the somnambulist Cesare, and awakens him for some moments from his death-like sleep.

After her brother is sent to Siberia, Sonja heads to Moscow to participate in a revolution.

Wilton, a hunchback, who was always scorned and ridiculed by women, returns from Java a rich man after having discovered a diamond mine. He romances Gina, who is on the rebound from a broken affair, and showers her with expensive gifts. After Gina reconciles with her boyfriend, she continues to see Wilton because of what he gives her. After he discovers her perfidy, Wilton develops a poison and mixes it into her lipstick, which will kill any man who kisses her.