Special Agent (1949)

Railroad detective Johnny Douglas investigates a payroll robbery and the murder of a train crew. Tedious but thorough police work leads him to the identities of two brothers, Paul and Ed Devereaux. The Devereaux brothers hide the stolen loot and return to their father's ranch,which they hope to save from foreclosure with the take from the robbery. When the sons of two of the murdered train crew discover the hidden payroll, Johnny has a chance to spring a trap on the Devereaux boys.