The Range Busters are a trio of vigilante do-gooders who uphold the law in the lawless West during the gold rush. When old rancher Magpie Harper is in trouble he calls for the Range Busters in Saddle Mountain Roundup. Unfortunately, the Range Busters get their late and find Harper murdered! This cowboy story becomes a murder mystery, as the heroes feel obligated to bring the murderer to justice. Smartly directed and scripted, Saddle Mountain Roundup features all the twists, turns, and gunfights that make classic Western cinema solid gold.