This book offers the first detailed comparison between Émilie Du Châtelet's philosophy and her predecessors G.W. Leibniz and Christian Wolff. It highlights the similarities and the differences between her work and the ideas of Leibniz and Wolff. The book's chapters explore a wide range of key concepts and topics, including freedom, love, space, extension, certainty, probability, the continuum, time, eternity, the world apart doctrine, and the principle of sufficient reason. The book as a whole situates Du Châtelet’s thought in the context of her predecessors and highlights how Du Châtelet’s understanding of her sources laid the foundations for the development of her own ideas. This edition will be of crucial interest to the growing community of scholars working on Du Châtelet’s thought as well as scholars of Early Modern Philosophy more generally.