A displaced banker guides tourists through the carnage.

As the sun begins to dip behind Wall Street's jagged towers, Andrew Luan, a former bond trader with Deutsche Bank (DB), marches a pack of tourists into the heart of the financial crisis. "It's not like there was a mastermind behind this," he says. But if there were, he'd know something about it.

Luan quit Deutsche Bank last week after failing to get a bonus for 2008. Instead of leaving Wall Street, Luan (pronounced lew-en) has launched a financial meltdown tour, guiding packs of mostly European tourists around the epicenter of the collapse-and explaining his own role in the crisis along the way. (He shorted collateralized mortgage-backed securities, a move he claims helped save Deutsche Bank from the subprime debacle.)*

Luan says senior traders could earn an obscene amount of money.* ("If I had gotten in five years earlier, I would never have to work again," he laments.) But his roots are humble. As a child, his family emigrated from Taiwan to Queens. His dad worked odd jobs and his mother sold public life insurance to low-income residents in Chinatown. Luan says he's ready to give back.

"I hope my tour will shed some light on issues that people are only beginning to see, let alone understand," he says. "It is ultimately the responsibility of the people to have government regulate new innovations and systems."

For only $40, he'll show you the word integrity engraved on the front of the New York Stock Exchange-and tell you about his all-male bond-trading desk's workplace push-up contests. Luan, 37, holds degrees from MIT where he T.A.'d an MBA economics course. He spent 10 years in Silicon Valley, spent three years on Wall Street, and has attended a Toastmaster's class in public speaking. He might also benefit from first-mover advantage. So far, he's the only ex-trader of toxic assets giving tours.

As the tour strolls through Wall Street's storied cobblestone streets, visitors eager for some insight into America's latest debacle snap photos and pepper Luan with questions about his life as a trader. An entertaining storyteller, Luan reinforces the worst of Wall Street's stereotypes. There's the boss who worked 20 hours a day and expected his underlings to do the same and who demanded that interns regularly deliver cups of ice "because he was a machine that needed cooling."