Ken Follett hits the top of his form with The Hammer of Eden, a state-of-the-art suspense thriller to rival his best.        When controversial radio talk host John Truth broadcasts a terrorist threat of a man-made earthquake, few people take it seriously. Crackerjack young FBI agent Judy Maddox is assigned to track down the elusive, sinister group called the Hammer of Eden.Judy's boss, who has a grudge against her, thinks he has given her a waste-of-time assignment. But Judy's research leads her to maverick seismologist Michael Quercus, who gives her the shocking news that it might just be possible for an earthquake to be deliberately triggered. And when a tremor in a remote California desert shows evidence of being machine-generated, Judy knows the threat is terrifyingly real.