 Two men utilize taxicabs to quickly stage armed robberies and flee to their own car. The Highway Patrol gives the two men s descriptions (and a special radio code) to local cab drivers, one of whom subsequently picks up the suspects. He recognizes them and transmits the code, but is murdered before his cab can be located. When the driver s body is found, Dan Mathews and his officers surmise that the suspects are still traveling in the cab and move quickly to try to find it before they have a chance to escape.