Hafsa, a talented art restorer freshly hired at the Louvre, plunges into chaos when she comes face to face with a millennial mask of the storm god "Belphegor". Suddenly involved in a series of inexplicable disappearances, a race against time begins for her. To bring out the truth, Hafsa will have to fight against those who stake her... and against her ghosts.

Based on the novel by Arthur Bernède (1927).