"Code of the Illuminati" delves into the clandestine world of the Bavarian Illuminati, offering an extensive and comprehensive examination of their historical theory, structure, and practices. This work, the third part of Abbé Barreul's polemic history of the French Revolution, stands out for its inclusion of substantial quotes from the actual literature of the Bavarian Illuminati. Founded in 1776, this secret society, with its revolutionary ideology and centralized structure, is portrayed by Barreul as a driving force behind the French Revolution, subverting Masonic lodges across Europe.

Barreul, a conservative historian, provides a non-neutral perspective, and Clifford, the translator, shares this approach. Despite the strong, biased perspective of the author, this remains a primary source, reflecting Barreul's serious historical inquiry and contemporary nature. Today, as society upholds the ideals of 'Liberty and Equality,' once feared by Barreul as potential civilizational threats, the Bavarian Illuminati's influence is debated, with some seeing them as precursors to later political movements. "Code of the Illuminati" invites readers to navigate through historical conspiracies and decide for themselves the enduring impact of this secret society on global affairs.