Deep in the Peruvian jungle, the team home in on a search area for Akakor, while Paul and Bobby uncover strange rumors about the man at the center of the legend. Martin, Karina and Brennon brave a wild river on a mission to find mysterious symbols that could be linked to the lost city.

Martin and Megan isolate an unexplained anomaly on a satellite image that could be a clue to our hidden lost city. Paul and Bobby dig deeper into the stories of the missing explorers, then fly to Rio de Janeiro to investigate the cold case murder of the journalist who wrote The Chronicle of Akakor.

Paul and Bobby find out Karl Brugger's murder was alleged to be a robbery, but that nothing was taken. Could his murder have been a targeted assassination? In Rio Branco, Brazil, Brennon and Karina attempt to verify Tatunca Nara's origin story, discovering evidence nearby of hidden jungle cities.