Tolstoy, the great Russian writer, wrote this book as a defense of Islam and the Prophet Muhammad, may God bless him and grant him peace, in the face of forgery and fabrication to whom the Islamic religion was presented at the hands of the associations of missionaries in "Kazan". In this book, Tolstoy offers a strong argument and proof against the plaintiffs, as he chooses a group of the hadiths of the Prophet and presents it after an introduction rich in information and ideas. Tolstoy provides a sharp critical view of religion, morals and historical facts, which makes this book an interesting reading of anyone interested in Russian literature or religious philosophy.