Labyrinth of Fire - Island of Fog, #2

Hal and his friends have arrived in a magical world full of mythical creatures. But there's no time to rest. As shapeshifters, important and dangerous missions lie ahead! Dewey quickly feels the pressure of dealing with ornery centaurs. Meanwhile, Lauren and Hal are quaking in their shoes, for the town in the north is under constant attack from harpies and dragons. These vicious creatures must somehow be reasoned with and persuaded not to plunder and steal, and most importantly, not to eat humans! The trouble is, neither harpies nor dragons are interested in negotiating. The shapeshifters join forces to deal with these serious issues.
They end up in the heart of dragon country, down in the Labyrinth of Fire beneath an oozing volcano. Somehow, they must make the dragons see the error of their ways. Their quest forces them to question the extent of their shapeshifting abilities... and this leads to a shocking discovery that is likely to start a war.