諾森伯蘭國家公園的伍勒森林裏，兩名遊客離奇失蹤。事件發生後，警方迅速搜索森林，卻始終一無所獲！魔幻偵探所成員經過幾番調查之後，確定森林裏有妖魔作怪。但這究竟是何種妖魔？它是怎樣形成的？又為何會有如此大的魔力呢？在傳媒的巨大壓力之下，員警總局副局長不等博士想好對策，便執意帶著警隊進入森林捉拿妖魔。他們能成功嗎？博士他們又會採取何種策略收服妖魔呢？
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