Pirates of the Purple Dawn by Tony Abbott

A Hidden Door.
A Magical Staircase.
Discover the World of Droon!

A villain from Droon's past has returned! Ving, leader of the Hawk Bandits, has teamed up with his twin sister, Ming, leader of the Hawk Pirates. Together the two brigands have plundered all of Droon's magical stones to build the legendary -- and deadly -- city of Mokarto.

There is just one stone the pirates can't steal, for only Princess Keeah knows its location. But that's not a problem for Ming and Ving, because they've kidnapped the princess! Can Eric, Julie, and Neal save their friend? Or will Keeah be forced to walk the plank?

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