Written by a leading expert, this is the ideal guide to the only book Wittgenstein published during his lifetime, the Tractatus Logico-Philosophicus. Michael Morris makes sense of Wittgenstein's brief but often cryptic text, highlighting its key themes. He introduces and analyzes Wittgenstein's life and the background to the Tractatus; the ideas and text of the Tractatus; and the continuing importance of Wittgenstein's work to philosophy today. Wittgenstein is the most important twentieth-century philosopher in the English speaking world. This book will be essential reading for all students of philosophy of language and metaphysics.