A hot July evening in 1981: 2,000 people were enjoying a tea dance at the recently opened Hyatt Regency hotel in downtown Kansas City, Missouri. A few minutes after 7pm, however, part of the hotel atrium collapsed. In the largest accidental structural failure in US history, 114 died and hundreds more were injured. This film recalls the tragedy, revealing the human errors behind the flawed design and how the shockwaves live on, over two decades later.