It's the thick of the mid-1990s boom, and David M. Gross is racking up billable hours for a Manhattan corporate law firm and thinking that there must be more to life. Out of the blue, a friend calls with a tantalizing and risky proposal: How would he feel about moving to Bologna to help turn around a legendary, down-on-its-luck Italian motorcycle company, known for its dominance on the track and its inability to turn a profit? After a brief soul-search...