In the vibrant and prodigious Reus of the 19th century, progress and modernity are beating with great force. In the daily hustle, the members of the elite society The Circle discreetly move the threads of power. When Joseph Boule, a mysterious businessman from France, arrives in the city, he arouses the interest of its members immediately. His fortune, intelligence and, above all, the secrets he seems to be keeping, make him a key piece of a puzzle that goes far beyond business and social relations. But what lies behind this elite? What hidden knowledge and ambitions drive the men in it? Rooms illuminated by the light of gas, silent conspiracies, and ideals of freedom, fraternity and power. Boule will be forced to decide to what extent he is willing to go to protect his past… or to be a part of a future that could change everything.