A young Wall Street dealmaker, Jayson Lyman gets an assignment. News/Worldweek, the media conglomerate that controls many of t he nation's top newspapers, magazines, and TV stations, has been targeted for a takeover by French magnate Marcel Bresson. Beating him should be a snap, says Lymon; no one wants a foreigner running the American press. I hope you're wrong says his boss--because he's your client. The more Lyman learns the more shadowy Bresson seem.