Robert Fogelin 
Wittgenstein-Arg Philosophers [PDF ebook] 

First Published in 1999. The purpose of this series is to provide a contemporary assessment and history of the entire course of philosophical thought. Each book constitutes a detailed, critical introduction to the work of a philosopher of major influence and significance. Except for the two closing chapters, this book is a careful examination of Wittgenstein’s chief works: Part One considers the Tractatus Logico Philosophicus; Part Two considers the Philosophical Investigations.