法、意邊境的阿爾卑斯山地區，接二連三發生兇案。受害者大都屍體完好，可身上的血卻被吸光了，犯罪現場白雪覆蓋，但卻沒有留下任何腳印！魔幻偵探所成員應邀調查此案，種種證據指向了十六年前逃走的那隻山妖。可是，他此次回來的目的是什麼？他為什麼變得如此殘暴？為了引出山妖，偵探所成員們扮成登山者，冒險進入山間。他們能否抓住山妖？案件真能否告破嗎？
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