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At Ranger headquarters, Captain Ainsley offers the support of his lawmen to stagecoach owner Edwards, whose Death Valley line is being robbed of gold shipments. Edwards has also called for help from government agents Ken Maynard, Hoot Gibson and Bob Steele, known as the Trail Blazers, who are due to arrive soon. On his way to Death Valley, Bob catches a ride with Edwards' stage after his horse goes lame. When the stage is attacked by bandits and the driver is shot, Bob takes over and tosses the strongbox off, intending to pick it up later. Bob's partners, Ken and Hoot, hear the gunshots and scare off the bandits, who find the strongbox and steal it. At Ranger headquarters, the Trail Blazers learn that the Rangers have been unable to trace the gold. A set-up in which Hoot expects to outwit the bandits with an empty strongbox then fails as the driver signals the bandits not to attack. The driver is arrested but refuses to name his cohorts. Meanwhile, the gang leader, Jim Kirk, who owns the Moranga Mine, reprimands Doc Farn, an escaped convict, for appearing in town when he should be at the mine. Ken recognizes Doc, and Bob pretends that he worked for Doc's former gang in order to gain his trust. While Doc takes Bob to a hiding place, Ken and Hoot learn that the Moranga Mine has been prosperous since Kirk took over. Ken and Hoot discover a chemist's lab inside the mine, but must escape before they can discover the contents of a safe. Kirk enlists Bob to kill Ken and Hoot, and Bob pretends to have done the job. Ken later returns to the mine and discovers the stolen gold in the safe, but he is captured by Doc, who reveals that he discovered a formula for reheating the gold and pouring it back into the rock, where it cannot be distinguished from virgin ore. With Kirk's gang in pursuit, Bob rounds up the Rangers. Kirk attempts to escape by stagecoach with the gold, but Hoot outwits him and replaces the driver. The Rangers and the Trail Blazers capture the gang, and after Bob bids farewell to Ainsley's attractive daughter Lorna, the Trail Blazers ride off for their next adventure.