Modern readers can still hear the echo of heated debates that outstanding Russian thinkers waged among themselves almost two centuries ago about the fate of Russia and its historical path. The books in the series “Crossroads of Russian Thought with Andrei Tesla” attempt to create an accurate and comprehensive picture of the intellectual life of Russia in the 19th century. Pyotr Yakovlevich Chaadaev is a colossal figure of the era, a man who had a huge influence on his contemporaries and to this day stands apart in the picture of social thought Russia. This collection includes all the main texts of Chaadaev: “Philosophical Letters”, “Apology of a Madman” and selected letters.