Finalist for the 2022 PROSE Award in the Philosophy category presented by the Association of American Publishers One over Many is a groundbreaking interpretation of Plato's philosophical outlook, solving longstanding problems in the scholarly literature. Its originality and its strength consist in replacing the metaphysical dualism of the traditional interpretation with the paradigm of unitary pluralism: one world with a gradation of reality, including three different types of Forms, as well as the entire spectrum of sensible phenomena, with intermediate ontological constructs in between. The model thus combines a monism of worlds with a pluralism of things, positing a unitary reality of infinite possibilities through ontological stratification. This tightly integrated collection of essays, conceived and developed by the author in pursuit of corrective intervention in Plato’s metaphysics, combines his previously published work with newly drafted material for the present volume. The book replaces the standard view of Plato as a metaphysical dualist with a novel interpretation providing greater explanatory power through the paradigm of unitary pluralism in a single reality built on ontological diversity.