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The "conspiracy" of the title refers not only to a deadly narcotics ring, but also the combined efforts by the good guys to capture the villains. Margaret Holt (Bessie Love) and her brother Victor (Bert Morehouse) team up to destroy the drug peddlers responsible for their father's death. They are aided in this endeavor by cub reporter John Howell (Hugh Trevor), and by sourpuss mystery writer Winthrop Clavering (Ned Sparks). In the film's tension-packed climax, avenging-angel Margaret slowly sneaks up on gang leader James Morton (Otto Matiesen), dagger in hand. A remake of a Paramount silent film, Conspiracy barely made back its cost, precluding any future remakes.