M. G. Leonard巧妙結合歷史與神話，打造出引人入勝的時間旅行冒險，讓青少年讀者在閱讀中學習維京文化。故事講述主角西姆和他的表妹傑波迪，在尋找失蹤的叔叔艾米特過程中，穿越時間來到維京時代的挪威峽灣及維京約克。他們發現叔叔正試圖找到傳說中的強大神器——掌管諸神黃昏的傳說號角Gjallarhorn。這號角擁有引發末日之戰諸神的黃昏Ragnarök的力量，若落入敵手，將釀成巨大災難。在歷史與冒險的交織中，主人翁們面對時間旅行帶來的危險和挑戰，不僅要阻止邪惡勢力，也要維護歷史的正確走向。小說融合了豐富的北歐維京文化細節、歷史知識與神話傳說，並藉由主角成長和家庭羈絆，展現勇氣與智慧。此書節奏緊湊，充滿追逐、偷盜、偽裝等動作，並深入探討時間旅行的規則與影響，是一部寓教於樂、適合青少年讀者的歷史奇幻小說。'A complete triumph of imagination . . . readers are going to fall in love with this brilliant series.' – A. F. Steadman, bestselling author of SkandarThe action adventure of Indiana Jones meets the time travel of Doctor Who in the second title of this epic series by bestselling award-winner M. G. Leonard. Perfect for fans of Adventures on Trains. Supports the key stage 2 curriculum. Illustrated throughout in black and white by Manuel Šumberac.Sim's Uncle Emmett is missing and on the run from the ruthless Council of Keys. Sim and his cousin Jeopardy are determined to find him. Their search takes them through a hidden door in time to
