"'Like life, a watch provides complications to keep it interesting.' Watanabe sat cross-legged on a low stage while we sat packed around him, students at the feet of a high-art Socrates, all leaning forward to hear his surprisingly delicate voice."   A luxury accessory that might, or might not, kill its owner. Does high risk mean high status? How does an ad man sell such a thing? Or is it all a hoax? A new novel explores the dark side of wealth culture.