Their trek from Madrid to Paris is fraught with danger, including:

A devout, traditionalist librarian and translator of Virgil who represents the conservative, religious side of Spanish society.

Navigating roads infested with bandits and staying in treacherous country inns.

In the late 1700s, during the reign of King Charles III, the ( Real Academia Española ) commissions two of its members to travel to Paris. Their goal is to acquire the 28 volumes of the first edition of the Encyclopédie by Diderot and D'Alembert—a monumental work of the Enlightenment that was strictly banned in Spain by the Inquisition. The "Good Men"

The two protagonists are unlikely companions with opposing worldviews:

A retired naval officer, rationalist, and skeptic who believes in the progress of science and the "lights" of reason.

Despite their ideological differences, they form a deep bond of friendship as they navigate the physical and moral challenges of their journey.