This book offers a sustained reevaluation of the most central and perplexing themes of Leibniz's metaphysics. Jan Cover and John O'Leary-Hawthorne examine the question of how the scholastic themes that were Leibniz's inheritance figure--and are refigured--in his mature account of substance and individuation. As a rigorous philosophical treatment of a still-influential mediary between scholastic and modern metaphysics, their study will be of interest to historians of philosophy and modern metaphysicians alike.