A decade ago, Darrin O'Brien entered prison a troubled young thug and left an international recording star. It was the kind of story a Hollywood screenwriter could hardly have topped, a nigh impossible yet classic tale of uncanny timing and fortune. But it was all very real. And it was exactly the kind of cyclone experience that could have left a youthful talent like O'Brien, better known to the world as Snow, chewed up in its wake. It didn't.