In the shadow of centuries, a secret waits to be uncovered. The smile of the Gioconda is not what it seems.Hidden among the brushstrokes of Leonardo da Vinci and the codes that only the most logical mind can decipher lies a message powerful enough to change history.Sherlock Holmes and Dr. Watson must face secret societies, traitors within the very heart of the government, and a labyrinth of manuscripts that defies reason itself.From the halls of the Louvre to the cloisters of Florence, each clue reveals a truth more dangerous than the last.The Secret of the Gioconda is a historical thriller that weaves together art, mystery, and Holmes's relentless powers of deduction-reminding us that the greatest enigmas are not always in what we see... but in what we are capable of observing.Prepare to enter a world where history hides in the details- and the truth lies behind an eternal smile.