It's fight night in a Berlin club. The lights go down, the door opens and out walks a salesman from San Francisco. David"Double D" Depto has traveled 8,000 kilometers in search of glory. As he first walks, then jogs, toward the boxing ring, the muscular, bare-chested American looks cool and confident. But so does his opponent. Waiting for him in the blue corner is Frank Stoldt, a tall, strong German policeman, who calls himself"Anti-Terror Frank." For obvious reasons, the crowd is on his side.