A corrupt rancher hires four soldiers of fortune to rescue his wife from kidnappers.

After the 1917 Mexican revolution, American millionaire J. W. Grant offers to pay four professional soldiers-of-fortune $1,000 apiece to rescue his Mexican wife, Maria, who was kidnaped by guerrilla-bandit Raza. The men employed are dynamite expert Bill Dolworth; professional soldier Henry Rico Fardan; wrangler-packmaster Hans Ehrengard; and black tracker-scout Jacob Sharp, an expert archer. They ride deep into Mexican desert territory until they reach Raza's encampment. A careful plan of strategy is worked out to split-second timing as they secretly break into Maria's room, fight off her guards, and carry her back into the desert. Then they learn that Maria was purchased by Grant, but she is Raza's lover and has no intention of returning to her husband. The adventurers, however, are determined to collect the reward, and they make for the border with Maria. Raza and his men eventually catch up with the four men and Maria at a narrow rock canyon. Dolworth sends the others on ahead and stays behind to await a showdown. Raza is badly wounded in the gunplay, and Dolworth rides on to the border. Once they all rendezvous, Maria exposes her husband's ruthlessness and begs to be allowed to return to Mexico. Raza arrives to claim Maria, and the four professionals hold Grant and his men at bay until the lovers have safely started back to their desert stronghold.