Bernie Madoff ran the largest Ponzi scheme in history for decades before it collapsed in December 2008, wiping out an estimated 65 billion dollars in supposed assets. This Frontline investigation traces the scheme back to its roots, opening with Charles Ponzi's 1920s postal-coupon fraud before tracking how Madoff built a similar structure on Wall Street respectability rather than street-corner hustle. Interviews with former employees, regulators, and journalists reconstruct how Madoff's firm produced steady, suspiciously consistent returns for investors ranging from retirees to charities to European banks, and how whistleblower Harry Markopolos tried for years to get the SEC to investigate before the fraud finally imploded under its own weight. The film examines why regulators missed it, how Madoff kept the illusion running by paying old investors with new money, and what happened to the victims left holding statements for money that never existed. It is a plain, procedural account of how a single man's credibility substituted for any actual investment for the better part of twenty years.