Longley has been a special marshal to the Texas town of Rio Nada. The area has been plagued by Mexican bandits who have used to the cross the border into the United States and raid the countryside. The gang is led by a mysterious leader known only as "El Sombro". When Longley captures an agent for El Sombro, he hopes to use the threat of hanging for the attempted murder of a deputy sheriff to force him to identify the illusive bandit chief. Written by
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Wild Jack Tobin
El Sombro has run the whole border, including Rio Nada, and yet nobody knows who he is.
Well, closing Rio Nada has pinched him where it hurt. It'll force him to a showdown and I've got a hunch that it will be soon.
And that'll be the end of your job here, Bill?
My job ends when the people of this town stand up to El Sombro and his kind.