After their father is killed, brother and sister Margaret and Victor Holt devote themselves to bringing down the drug gang responsible for his death. Victor rises to become an attorney in the district attorney's office, and eventually Margaret wangles her way into becoming the secretary for James (Marco) Morton, the head of the drug ring. When Morton discovers Margaret's true identity, he contrives a plot to lure her brother into a trap and kill him. Margaret learns of the plot and rushes to save her brother. In the ensuing melee, she kills Morton in her attempt to save Victor, who is also seemingly killed. Afraid of being convicted of murder, she flees the scene. In hiding, she becomes friends with a mystery author, Winthrop Clavering, and a reporter, John Howell, the truth about the murder is revealed, and it is discovered that Victor was not killed, but is being held prisoner by the drug ring. Victor is rescued, and Margaret and John develop a romantic relationship.