This book is a detailed study of the plays of Sophocles through examination of a single ethical principle. Sophocles has traditionally been considered the least philosophical of the three great Greek tragedians, but Professor Whitlock Blundell offers an important new examination of the ethical content of the plays by focusing primarily on the traditional Greek popular moral code of 'helping friends and harming enemies'. Five of the extant plays are discussed in detail both from a dramatic and an ethical standpoint, and the author concludes that ethical themes are not only integral to each drama, but are subjected to an implicit critique through the tragical consequences to which they give rise. Greek scholars and students of Greek drama and Greek thought will welcome this book, which is presented in such a way as to be accessible to specialists and non-specialists alike. No knowledge of Greek is required.