On August 1st, 1966, a sniper rode the elevator to the top floor of the University of Texas Tower and opened fire, holding the campus hostage for 96 minutes. When the gunshots were finally silenced, the toll included 16 dead, three dozen wounded, and a shaken nation left trying to understand. Combining archival footage with animation, Tower reveals the action-packed untold stories of the witnesses, heroes and survivors of America's first mass school shooting, when the worst in one man brought out the best in many others.