Bryce Johnson, Dr. Mireya Mayor, and Russell Acord scour North America in search of the cryptid known as Bigfoot; they return to northern California to explore compelling evidence and unlock this centuries-old mystery.

Deep in Northern California's lost coast, an audio expert joins the fold after the team hears unusual sounds. Russell must take shelter from a storm, and Bryce speaks with a local Hoopa Tribal Council member after reviewing illuminating footage.