“Letters from the Caves and Wilds of Hindustan” is perhaps the most “scientific” and “realistic” book in the work of Helena Blavatsky, one of the greatest theosophists, philosophers and mystics of the second half of the 19th - early 20th centuries, a woman who spent many years studying esoteric teachings of various peoples - and created on the basis of these teachings its own - comprehensive, unique, very unusual - and surprisingly logical in its obvious unorthodoxy. Mysticism of India - through the visionary gaze of Helena Blavatsky. The secret doctrines of Buddhism and Hinduism as perceived by the master of esotericism, who constantly relied on them in his teaching. A journey through real Hindustan - turning into a journey through philosophical Hindustan!..