The author writes in a sublime French, the eighteenth century iéme, it makes the Paris of the living time and I am grateful. The enigma is childish and passionate little, however, the author is the case in 1780, was inspired by a 1781. It reveals a crucial fact: at the time, was a military, to conquer, commit colossal sums name and issue bills without referring to the royal authority. It was a dangerous game because if they lose, the consequences could be terrible. The author asks (indirectly) another question: is it better to balance a state budget or take revenge on the English enemy? In other words: should we sacrifice the honor in favor of a bourgeois living happiness of balanced accounts? the book is relevant and goes beyond its simple-level police investigation under Louis XVI; he makes us understand that a loan of 15 years comes down to the issue of 15 bills of exchange; this is the game that engage our ruling circles; How will end this game? like in 1789?