Like the first entry in the "Range Busters" series, the 1941-42 season opener Saddle Mountain Roundup was as much a whodunit as a western. This time, the murder victim is irascible rancher Magpie Harper (John Elliot). Arriving too late to save Harper from his fate, heroes Ray "Crash" Corrigan, John "Dusty" King and Max "Alibi" Terhune commit themselves to solving the murder. The identity of the killer is tipped off by the actor's prominence in the screen credits (at this time, he was usually cast in uncredited bit roles). Fairly well directed and acted, Saddle Mountain Roundup is compromised a bit by the surprising shoddy editing of Ray Claire.