In "Dot Con," award-winning FRONTLINE producer Martin Smith takes an inside look at the precipitous rise and fall of the Internet economy -- and examines the allegations that brokers at some of Wall Street's most prestigious firms manipulated the hot IPO market of the late 1990s. Wall Street, of course, would prefer to forget the past. But investors and investigators want to know: During the headiest days of the Internet bubble, did investment banks and venture capitalists betray the public's trust? Did "irrational exuberance" give way to fraud?