Frontier Investigator (1949) is a Action, Western film that follows rocky Lane, out to find the murderer of his brother, runs into a battle between two stage lines for a mail contract. Frontier Investigator is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 9.0 out of 10 from 1 votes. Fans of action movies may also want to explore similar titles below.