A thrilling sequel from an exciting voice in middle-grade sci-fi tracks two ocean-born children braving the dangers of the Above World. The desert is no place for ocean-dwelling Kampii like Aluna and Hoku, especially now that Aluna has secretly started growing her tail. But the maniacal Karl Strand is out to conquer the Above World, and the horselike Equians are next on his list. Aluna, Hoku, and their friends -- winged Calli and Equian...