Unity of Plato's Thought

 The Unity of Plato's Thought by Paul Shorey, 88 pages

There is a popular school of interpretation of Plato's works which insists that the philosopher profoundly changed his views on a variety of important topics over the course of his career.  In this book, Paul Shorey attempts to demonstrate that most of the evidence these critics rely upon is the product of Plato's rhetorical method (especially his tendency not to recapitulate discussions present in a fuller form elsewhere in the dialogues) and their own attempts to construct out of Plato's works a theoretical system more comprehensive than the one upheld by the actual Plato.

The Unity of Plato's Thought is somewhat deceptive.  The introduction is flashy, witty, and argumentative, while the main text is sober and methodical - in addition, it demands a certain knowledge of Greek.  This is a substantive book on an important subject, but quite technical.