The Maya built pyramid cities across Mesoamerica between roughly 300 and 900 AD, then their kings, calendars, and temples fell mostly silent, and only four books of Maya writing survive to explain any of it. The film opens with the achievements: astronomical calculations precise enough to track Venus, the terraces and observatories of Chichen Itza, a network of independent city-states rather than one unified empire. Then it turns to 1947, when Giles Healy is led to a temple at Bonampak whose walls carry painted murals of battle, torture, and human sacrifice, upending the earlier image of the Maya as peaceable stargazers. Scholars weigh competing theories about who influenced Maya knowledge, floating comparisons to Egypt, Greece, and even Atlantis, without settling on an answer. On the collapse, the film argues against famine or invasion and instead traces a pattern of cities emptied by their own people, faith and political structures giving way from within. It leaves the two central questions, what the Maya knew and why they left, open rather than resolved.