Missing (S01E04)

Bobby and Paul encounter a German documentary maker who cautions them that delving into the mysteries of Akakor may be perilous. The group gathers in the Amazon's biggest city, preparing for an expedition along the Rio Negro to locate Akakor's sister city, Akahim. Meanwhile, Martin, Megan, and Brennon embark on a trek to a secluded plateau, where legends suggest the entrance to the fabled city lies hidden behind an enormous waterfall.