In the year 1355, in Paris, a man is burned alive in a public place. Nicolas Flamel witnesses this execution, and for the future famous alchemist, it is only the beginning of a journey full of gruesome revelations sparked by a forbidden book. Fast forward to 2007, where Antoine Marcas, a Freemason and commissioner, is confronted with two ritual murders carried out by one of his own brothers, also known as the "Brother of Blood." A clue soon leads him to an ancient secret linked to the mystery of pure gold. The investigation takes them from Paris to New York, creating a race against time between the serial killer and the police officer, centered around two symbolic locations: the Statue of Liberty and the Eiffel Tower. According to François Vey of Le Parisien / Aujourd'hui en France, the story is not only thrilling and well-documented, but the authors' palpable joy is also infectious.