Tim Hart (Tim McCoy), a former Texas Ranger, comes out of retirement to avenge the death of Lightnin' Ed (Frank LaRue), his foster father, who had been sent to Rainbow's End, to investigate a series of train robberies. He senses that George Johnson (Walter McGrail) and his henchman, Speck (Bob Kortman), head the robbery gang, especially after Speck makes an ambush attempt on his life.

Meline is taking money from his own bank to drill an oil well. When he finds Doug Redfern's bandana, he has his gang rob his bank and uses the bandana to frame Doug. When Doug is convicted but immediately paroled, Meline has another plan that he thinks will put him away permanently.

When the Governor gets Dawson to go after Ace Carter and his gang, Dawson gets him to release four prisoners into his custody. Arriving in town, Carter frames Dawson for murder and his stooge Judge sentences him to be hung. The four ex-convicts arrive in time to save Dawson but one of the four is a double-crosser and this means more trouble for Dawson.