France, late 18th century. The time is interesting, but vague: a revolution is brewing, books are being destroyed, hundreds of people are in prison. Don Hermogenes Molina, a brilliant expert on Latin and an incomparable translator of Virgil, together with the retired commander Pedro Zarate, goes to Paris - they need to find the first edition of the Encyclopedia by Diderot and D'Alembert. But this is not at all easy, because the book has long been banned. Mercenaries from all over the world are hunting for her and are ready to do anything to get her. Friends must be the first to get to the treasured work at all costs and try not to die in such a dangerous adventure.