This book reveals a thread that runs through Leibniz¿s metaphysics: from his logical notion of possible individuals to his notion of actual, nested ones. It presents Leibniz¿s subtle approach to possibility and explores some of its consequential repercussions in his metaphysics. The book provides an original approach to the questions of individuation and relations in Leibniz, offering a novel account of Leibniz¿s notion of Nested Individuals.