Longarm's the only one who can identify the bandit they call El Anguila del Desierto--The Desert Eel. It's been a few years since Marshal Long first hauled the slippery crook in. But the Mexican Rurales will line their five best suspects in front of a firing squad's wall unless Longarm can pick out the genuine article. So, Longarm heads off for the border. It's a treacherous trail that matches him against fast guns, hostile authorities, and some very friendly women on both sides of the Rio Grande
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