No cigars, no conspiracy, no stolen cent. Jerome Kerviel, son of a blacksmith and a hairdresser from Brittany, an average student with a degree designed for back-office paperwork, sat at a standard-issue computer at Societe Generale and secretly wagered 49.9 billion euros, more than the bank itself was worth. When the digital house of cards collapsed in January 2008, the bank realized roughly 7 billion dollars in losses, and the world met the most baffling rogue trader in European history.

This episode explains how the quiet compliance guy became the casino security guard handed chips on his own floor: the five years he spent learning where the camera blind spots were, the Delta One desk where safe arbitrage turned into unhedged directional bets, and the timer-reset loophole that hid a fortune inside a blizzard of trading noise. It follows the aftermath too, from the fire-sale unwind during a global crash to a walking pilgrimage from Rome against "the tyranny of the markets," a wrongful-termination win, and the unsettling concept the saga exposed: black swan blindness.

• Mr. Average: the back-office compliance training that taught Kerviel every blind spot in the system
• Arbitrage explained with apples, and how Delta One's trade blizzard camouflaged a 50-billion-euro gamble
• Skydiving without the reserve chute: what unhedged directional bets actually mean
• Why the bank's algorithms hunted greedy hotshots and missed a plumber flooding the building
• From rogue trader to anti-capitalist folk hero: prison, the pilgrimage, and the movie