在這本書中Eric、Julie和Neal這三個好朋友將和公主及Sparr一起到Zorfendorf城堡去解開一個謎語，而這個謎語又為什麼會跟Eric及Sparr有關呢？這是怎麼回事呢？Sparr會回到Ko的身邊嗎？背後是否藏者什麼祕密呢？ Eric、Julie和Neal這三個好朋友，在幫Eric清理地下室時無意間發現了通往另一個世界--Droon的秘密通道，而這一系列的故事便是在描寫當他們經由通道來到Droon所發生的種種不可思議的事情，究竟在Droon藏著多少不為人知的秘密嗎？適合6歲以上兒童閱讀。There's only one passage between the Upper World and Droon -- the magical rainbow staircase. At least, that's what Eric and his friends have always believed. But now Ko and his beasts are attacking Zorfendorf Castle, a magical fortress that's hiding a huge secret: the Fifth River, another passage to the Upper World. Ko will do anything to get to the river -- and to the Upper World. And Eric, Julie, Neal, and Keeah will do anything to stop him!
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