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The Carly twins are identical - except one is good and the other is very bad. But when Blake guns down a sheriff, Abel runs with him because seeing his murderous brother lynched would be like watching  himself hang. Then the killing leads to more killing, and Abel starts to realize just how far his evil sibling will go to save his own skin.
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As Arizona ranger Sam Burrack closes in on the Carlys, it looks like he'll be bringing them back tied over their saddles. Instead, when the shooting stops, Burrack finds Abel mourning his dead brother. That should mean the worst is over. But Barrack suspects  that something is very wrong here - and that the slaying isn't done yet.