The book by A. P. Sinnett, a prominent theosophical writer, was written on the basis of personal observations of the author, who was a witness to numerous occult phenomena. This is the first small book by an English gentleman, a contemporary and eyewitness of the sensational “mystical phenomena” of the founder of the Theosophical Society, H. P. Blavatsky , gives a clear idea of the shock that representatives of Western civilization experienced at the end of the 19th century when confronted with occult experience and the philosophical doctrine of the East. The subsequent famous book by A.P. Sinnett, “Esoteric Buddhism” (1885), covers fundamental questions of the occult worldview, was created on the basis of the author’s correspondence with adherents of the secret society of the Himalayan Brothers and is also of significant interest.