This book offers a new interpretation of Plato's early and middle dialogues as the expression of a unified philosophical vision. Whereas the traditional view sees the dialogues as marking successive stages in Plato's philosophical development, we may more legitimately read them as reflecting an artistic plan for the gradual, indirect and partial exposition of Platonic philosophy. The magnificent literary achievement of the dialogues can be fully appreciated only from the viewpoint of a unitarian reading of the philosophical content.