Arthur and Maudie Brightstorm are back home in Lontown and finally settling in after their exhilarating--and secret--adventures in Erythea. Maudie's sky-ak invention is a hit, and Harriet has just announced that she will share her sky-ship's hydroelectric technology. But tensions are brewing. Pitch is becoming more and more difficult to mine, and the existence of super-sapient creatures on other continents threatens how the Explorers see...