The adventure begins when Hildy Corrigan befriends a new girl named Dixie Mae, who confides to Hildy that her father is a notorious bank robber and has kidnapped her from her mother. Dixie Mae is afraid of her father, who plans to rob a nearby train carrying millions of dollars in gold.
Aided by her feisty tomboy cousin, Ruby Konning, and her friend Spud, the three friends risk their lives to help Dixie Mae escape her captor and to stop the train from being robbed.
Chased across a trestle, tapped and captured, bound and placed with explosive cargo in boxcars plummeting down mountain tracks to certain destruction what an adventure!