Radda-Bai is the literary pseudonym of Helena Petrovna Blavatsky, a famous writer, creator and inspirer of theosophical teaching. The proposed book is a story about the life path of Madame Blavatsky, written by her sister, the once famous children's writer V.P. Zhelikhovskaya. The narrative, sometimes very personal, biased, in which echoes of the spiritual and literary struggle of those days are felt, introduces the bright and complex fate of this outstanding woman, with the main provisions of her teaching.