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.

"I walk into Brooksley's office one day; the blood has drained from her face," says Michael Greenberger, a former top official at the CFTC who worked closely with Born. "She's hanging up the telephone; she says to me: 'That was [former Assistant Treasury Secretary] Larry Summers. He says, "You're going to cause the worst financial crisis since the end of World War II."... [He says he has] 13 bankers in his office who informed him of this. Stop, right away. No more.'"

Greenspan, Rubin and Summers ultimately prevailed on Congress to stop Born and limit future regulation of derivatives.

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