After unearthing a series of new artifacts at Blind Frog Ranch, the Ollingers bring in experts to analyze them. Startling discoveries suggest that the body of the ancient Aztec emperor Montezuma could be buried beneath the Ranch.

Chad brings the BFR team together with top experts to examine all of the artifacts and evidence they've collected during the last dig season. Geologist Hector Estrella theorizes that water moving underground could be creating the mysterious rumble the team has experienced on the ranch. Roger Blomquist believes the altar at the Bead Site could be evidence of Montezuma's tomb buried under the rock formation. Bob Morton authenticates the composition of the Jade Bead, likely a sacred Aztec artifact carried all the way from Mexico to BFR. Mark Julian suggests that digging on the ranch has awoken a dark shapeshifting creature that could be a skinwalker.

Chad traces the underground cavern to a mysterious bear marker and a cave hiding a gold ledger, which points them to an ancient Aztec outpost.