The Lightning Thief.(Brief Article)(Children's Review)(Book Review)

The Lightning Thief RICK RIORDAN. Hyperion/Miramax, $17.95 (384p) ISBN 0-7868-5629-7

A clever concept drives Riordan's highly charged children's book debut (the first in a series): the Greek Gods still rule, though now from a Mt. Olympus on the 600th floor of the Empire State Building, and their offspring, demigods, live among human beings. Narrator Percy Jackson thinks he's just another troubled 12-year-old, until he vaporizes his math teacher, learns his best friend, Grover, is a satyr and narrowly escapes a minotaur to arrive at Camp Half-Blood. After a humorous stint at camp, Percy learns he's the son of Poseidon and embarks on a quest to the Underworld with …