Cifra y sal : Una novela de Jorge Juan y Alexander Campbell (1735-1750)

18th century. In the midst of the struggle for maritime dominance, two men confront a world of secrets, science, and betrayal. Jorge Juan, a naval officer, spy, and royal scientist, is ordered to infiltrate British shipyards to steal key naval knowledge. Previously, he was part of the Franco-Spanish geodesic expedition in the Andes, where science was merely a facade for something far more complex. Meanwhile, Alexander Campbell, a former prisoner of war, returns to London torn between two sides and a secret that could change everything.