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A collection of artifacts from an archeological dig in Egypt are brought to the
famous Louvre museum in Paris, and while experts are using a laser
scanning device to determine the age of a sarcophagus, a ghostly spirit
escapes and makes its way into the museum's electrical system. Museum
curator Faussier (Jean-Francois Balmer) brings in a noted Egyptologist,
Glenda Spencer, to examine the findings, and she announces that the
mummy inside the coffin was actually the evil spirit Belphegor. Lisa, who
lives across the street from the museum, follows her runaway cat into the
museum after closing time, where she is accidentally given a shock that
sends the stray spirit into her body. Soon, Lisa is disguising herself as
Belphegor and making off with the rare Egyptian treasures on display at the
museum, convinced that they are rightfully hers. When "Belphegor" proves
more than a match for the Louvre's security forces, renowned detective
Verlac is brought out of retirement to find out why the museum's Egyptian
collection has been shrinking.