Forensic geologist Scott Wolter travels from the Serpent Mound of Ohio to ancient serpent-shaped mounds and stone monuments in Scotland, testing the idea that the two sites share more than a coincidental shape. He walks the earthworks with local archaeologists and historians, examines carved stones and site alignments, and lays out the case some researchers have made for a shared symbolic tradition, or even a traveling network of knowledge-keepers, moving between continents long before Columbus. The film weighs the serpent imagery against known trade routes, migration theories, and the archaeological dating of both sites, letting skeptics and believers each make their argument on camera. Wolter's own conclusions lean toward deliberate contact rather than coincidence, but the film keeps the counter-evidence in frame, including the gaps in dating and the lack of direct physical proof connecting the two mound-building cultures. It ends without a final verdict, treating the serpent mounds as an open puzzle rather than a solved mystery.