In The Warning, veteran FRONTLINE producer Michael Kirk unearths the hidden history of the nation’s worst financial crisis since the Great Depression. At the center of it all he finds Brooksley Born, who speaks for the first time on television about her failed campaign to regulate the secretive, multitrillion-dollar derivatives market whose crash helped trigger the financial collapse in the fall of 2008.

“It’ll happen again if we don’t take the appropriate steps,” Born warns. “There will be significant financial downturns and disasters attributed to this regulatory gap over and over until we learn from experience.”