The global war between the super scientific agency known as Sci-Tech and the stealth-warrior Naturalists reaches skyward! Young Leo Lomax must don a rocket pack and join the Sci-Tech Air Rangers to rescue a friend from the murderous clutches of a shape-shifting Harpy! The result is mayhem over San Francisco, as a deadly aerial duel erupts! Plus: The shocking secret history of Sci-Tech finally is revealed; and the debut of the bright, beautiful silicon-chip woman called Omnia, whose connection to Leo will shock you!