Kate Tarleton grows up on a Southern plantation and becomes engaged to her guardian, Dr. Robert Manning, a famous surgeon. When Robert, Kate, and her younger sister Mary Lou visit New York, where the doctor wishes to conduct medical experiments, the superstitious Kate goes to the home of a fortune-teller named Stella Hill. Stella, whose principal business is white slave trafficking, drugs Kate and forces her to work in a "den of vice," run by Stella and her accomplice Jimmy Bristol, where she contracts syphilis and goes insane. Robert, Detective Ellis, and a lawyer named Billy Meredith rescue Kate, who recovers her sanity but remembers nothing of her bondage.

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