Akiko in the Sprubly Islands

In this companion novel to Akiko on the Planet Smoo, fourth-grade earthling Akiko and her odd team are on a journey to save the kidnapped Prince Froptoppit from the evil Alia Rellapor. Unfortunately, on their way to Alia Rellapor's castle, the group has gotten lost while sailing over the Moonguzzit Sea in their flying boat. With no maps available, the team's best hope is to find Queen Pwip of the Sprubly Islands, a clairvoyant, who will be able to point them in the right direction.
But the Sprubly Islands aren't like Akiko's hometown, and when Spuckler and Mr. Beeba disappear one night, Akiko is left to decide how she is to survive in this strange new world.