Hafsa, a talented art restorer newly hired at the Louvre, comes face to face with a millennia-old Mesopotamian mask representing the storm god Baal Phegor, known to the uninitiated as Belphegor. Soon entangled in a series of inexplicable disappearances, with no memory of her involvement, she finds herself in a race against time at the heart of the world's greatest museum. Hafsa must fight both her pursuers and her own demons to uncover the truth and understand the powerful bond that ties her to Belphegor.

A rogue poses as the Comte he killed and weds the Princess, but the heir to the throne steals their child.

Four episodes chronicle a mysterious phantom who appears in the Musée du Louvre in Paris at night. Neither guards nor police are able to make an arrest. But a curious young man tries to break the ice and discover what drives the creature and its activities.

美丽的姑娘丽莎（苏菲·玛索 Sophie Marceau 饰）和祖母一同居住在卢浮宫对面的大楼。卢浮宫的修葺工程使老旧的大楼常出问题，丽莎因此结识了善良的电工小伙马丁（弗雷德里克·迪方多 Frédéric Diefenthal 饰）。某次的施工无意中打通了卢浮宫地道与大厦的电梯间，丽莎与马丁因此夜入卢浮宫，走进了科学家们研究古埃及木乃伊的实验室。丽莎与一具木乃伊干尸对望，没想到却使木乃伊中的鬼魂进入了她的身体，从此每到深夜，丽莎便被鬼魂驱使在卢浮宫里游荡，搜寻古埃及的护身符。馆长请来经验丰富的退休警察弗拉克（米歇尔·塞侯 Michel Serrault 饰）负责调查卢浮宫幽灵事件，从英国来的埃及学专家格兰达（朱莉·克里斯蒂 Julie Christie 饰）也帮了大忙。但众人的努力是否真能制服丽莎体内的强大幽灵呢？