<P>In Salthill-on-Hudson, a half-hour train ride from Manhattan, everyone is rich, beautiful, and -- though they look much younger -- <I>middle-aged.</i> But when Adam Berendt, a charismatic, mysterious sculptor, dies suddenly in a brash act of heroism, shock waves rock the town. But who was Adam Berendt? Was he in fact a hero, or someone more flawed and human?