When she arrives at the Salon-de-Provence castle, Madeleine discovers that the accident that befell Philibert the librarian was no other than a murder. Nostradamus's prophecy is underway and suspicions are growing around Jean-Aimé de Chavigny. The royal family is in danger! Following in her father's footsteps, Madeleine must solve mysteries involving astrology and alchemy to uncover the truth.
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