Dirty Money

E1. Hard NOx

Volkswagen's "clean diesel" cars seemed like a dream come true for carbon-conscious drivers -- until a fraud of staggering proportions came to light.

★ 8.5

E2. Payday

Behind the lavish lifestyle of race car driver Scott Tucker lay a secretive lending empire built on tribal perks and profits from poor customers.

★ 8.3

E3. Drug Short

When drugmaker Valeant began to grow at dizzying speeds, investors were thrilled. But a handful of skeptics realized something was very wrong.

★ 6.7

E4. Cartel Bank

A trail of suspicious transactions led to startling revelations about banking giant HSBC and its ties to Mexico's deadliest drug cartels.

★ 7.7

E5. The Maple Syrup Heist

An unusual heist that made headlines around the world highlights a bitter feud over one of Canada's most precious resources: maple syrup.

★ 5.7

E6. The Confidence Man

Donald Trump's image as a savvy businessman dazzled millions. But journalists and former associates describe an empire awash in drama and shady deals.

★ 7.7