The cinematography seems almost to simulate a graphic strip, to the extent that when the film started I wasn't sure if it was real or animated, although this confusion didn't last long.
Adèle, who should be in Peru researching her new book, is in fact in Egypt to recover the mummy of the doctor to the Pharos, whom she believes could help her sister. The small problem of the mummy being long since deceased is to be overcome with the help of a 'mad' scientist who has already resurrected a pterodactyl from its egg in a Paris museum; so a mummy should be easy.
Unfortunately the pterodactyl is causing mayhem, including the death of a politician and his mistress, so the scientist has been arrested and sentenced to death. Such problems are not insurmountable for Adèle, who embarks on a succession of hare-brain schemes to release the scientist, after her appeal to the French president fails, spectacularly!