Just before midnight on March 12, 1928, the St. Francis Dam, a 12-story-high concrete structure just 50 miles north of Los Angeles, suddenly collapsed, releasing a devastating flood that roared 53 miles to the Pacific Ocean, destroying everything in its path. What caused this unexpected catastrophe, and why are the facts largely missing from history books? With research gathered over more than two decades, award-winning writer and filmmaker Jon Wilkman revisits the deluge that claimed nearly 500 lives.