The book explores the question: did Masonic lodges have any impact on the revolutionary processes in Russia at the beginning of the 20th century. The author raises a problem that for a long time remained a "closed zone" for Soviet researchers and a "white spot" in history: were Russian Masons a political force in the beginning of the 20th century? What is their role in the February and October revolutions? The study is based on rare documents, memoirs. The book is polemical, debatable. Addressed to all those interested in issues of Russian history.