The rise and spectacular fall of the friendship between the two great philosophers of the eighteenth century, barely six months after they first met, reverberated on both sides of the Channel. As the relationship between Jean-Jacques Rousseau and David Hume unraveled, a volley of rancorous letters was fired off, then quickly published and devoured by aristocrats, intellectuals, and common readers alike. Everyone took sides in this momentous dispute between the greatest of Enlightenment thinkers.

In this lively and revealing book, Robert Zaretsky and John T. Scott explore the...