In the quiet Colorado town of Granby, a seemingly ordinary man named Marvin Heemeyer nurses a deep-seated grudge that will erupt in an unprecedented act of defiance. Directed by Paul Solet, the documentary "Tread" meticulously reconstructs the true story of a skilled welder who feels betrayed by his local government and neighbors after a bitter zoning dispute. Through interviews with townspeople, law enforcement, and archival footage, the film explores Heemeyer's transformation from a respected businessman into a figure of singular obsession. As his grievances fester over years, he embarks on a secret, alarming project in his muffler shop, methodically armoring a massive bulldozer. The film builds with the tension of a thriller, charting the inevitable collision between one man's quest for vengeance and a community completely unprepared for the chaos he is about to unleash, culminating in a surreal and devastating showdown that captures national attention.