An underground cavern connects Mexico to a Native-American reservation in the United States. The leading candidate for Governor of Texas appears to be connected to the operation. Armstrong Dent must discover the truth behind decades-old scheme without undermining the undercover identity of one of his newest team members. "Armstrong Dent and the Kickapoo Borderland Band" is one of the first season's ten standalone, short tales which lead up to the novel "Armstrong Dent and the End of the World as We Know It."