Lois Fox, upon whose shoulder is branded a Chinese ideograph resembling the letters \"A. Y.,\" is rescued from a gang of Chinese ruffians by Brice Ferris. His servant Ming, in attempting to steal from her finger a ring that bears a mysterious green seal, is killed, and soon afterwards a stranger named Strang arrives, also in search of the girl. Despite Brice's efforts to protect her, Lois is abducted and taken to the headquarters of Lao Wing, the leader of a secret Chinese society known as the Tong. Ferris and chief of police Struber finally infiltrate the gang's headquarters and after a furious battle, Lois and Strang are freed. Strang, actually Lois' uncle, reveals that the sacred ring had belonged to an ancient Chinese order but had been stolen by Lois' father.
