Railroad detective Matt Clark solves mysteries with his assistant.

Rube Burrows becomes infamous through the south for train robbery, but his girlfriend is portrayed as the brains; Margaret ingratiates herself with the outlaws leading to a deadly showdown.

A former deputy and his gang terrorize a town with the help of a corrupt sheriff.

Matt and Margaret investigate the kidnapping of banker Penrose from a stagecoach; they immediately suspect noted bandit Milt Sharp who recently escaped from a Nevada prison and his partner Dutch; a showdown takes place at the Penrose home.

Matt and Margaret investigate when a railroad payroll worth $25,000 is stolen.