The Cabinet of Dr. Caligari is a 1920 silent horror film that tells the story of Dr. Caligari, a sinister hypnotist, who uses a sleepwalking patient named Cesare to commit murders. The film is famous for its groundbreaking visual style and twist ending.

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.

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