Ko is back in power -- and nothing in Droon is safe! His beasts have found a lightning-powered submarine hidden in the secret Fortress of the Treasure Queen. Now Eric and his friends have to stop Ko before he destroys Jaffa City. But first they'll need help from their worst enemy -- Lord Sparr. If he can be trusted . . . .

作者簡介：

Tony Abbott is the author of more than thirty funny novels for young readers. Since childhood he has been drawn to stories that challenge the imagination, and, like Eric, Julie, and Neal, he often dreamed of finding doors that open to other worlds. Now that he is older, he thinks he may have discovered some of those doors. He calls them books.