魔幻偵探所突遇少年求助者，少年求助者稱他看到食人的妖怪，並能將魔怪的外貌特徵描述地很詳細。雖然小助手們都認為少年求助者是惡作劇，但是博士卻相信他沒有撒謊，並決定帶著小助手們去案發地一探究竟！失蹤案發生地里布森河與附近的神秘科德古堡之間到底存在著什麼聯繫？魔怪與兩者之間又有何關係？魔幻偵探所的成員們是如何揭曉謎底，又是如何抓獲魔怪的？
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