The 9/11 truther movement gets a close look here, following the people who built and spread the theories that the September 11 attacks were an inside job or a government cover-up. The film returns repeatedly to Ground Zero and traces how outlets like Loose Change turned into a durable subculture with its own celebrities, arguments, and internet infrastructure. Interviews with key figures in the movement let them make their case directly, laying out the physical and procedural claims that made towers, a Pentagon, and a field in Pennsylvania into evidence for a wider plot. The film treats these believers as a real social phenomenon worth understanding rather than a punchline, tracking how a fringe reading of one catastrophic day metastasized into a template that later conspiracy movements would reuse. It stays focused on the people and the mechanics of belief rather than adjudicating the physics, leaving viewers to weigh the claims against the movement's staying power two decades on.