Masterfully written, gripping literary work, heavily seasoned with elements of mysticism—or, as the author himself puts it, “the rantings of a madman”? It’s quite obvious that this is a meticulous work of a scholar-researcher (in the broadest sense of the word) with a stunning literary talent. This is a researcher whom Nature endowed with a unique tool (“spiritual vision”), allowing him to penetrate the immaterial structures of the Universe and bring to humankind (which until then had been satisfied with only vague hints) the revelation of multiple worlds—worlds that coexist with ours and closely interact with it. These worlds lie beyond ordinary human perception. There is no doubt that Andreev brilliantly fulfilled what was prescribed from above, and now we have the opportunity to touch an unknown reality.