A teletype warns of a couple hold up men heading to the city, it’s up to Joe Friday to catch them.

Working the Robbery detail with partner Frank Smith, Joe Friday gets the word on the Martin brothers. It doesn’t take long for robberies to pop up with the methods that point to the Martin brothers. Witnesses and informants give information. The trail leads from one shady character to another. Through the typical plodding police routine as the cops deal with the underside of society, the vicious crooks are rounded up and taken to justice.