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The Mystery Trooper Synopsis

Jack Logan is the heir to half of a map to a hidden Indian mine. The trader and villain Jean Gregg sends his chief henchman Mack to make life difficult for Jack. Jack is aided in his quest by the heirs to the other half of the map: Helen Holt and her younger brother Billy, and by a uniformed mystery man known as "The Mystery Trooper".

The Girl in the Dark Synopsis

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.