The new book of the famous national ethnologist A.B. Ostrovsky continues a series of his works devoted to the mythological thinking and beliefs of the indigenous peoples of the Russian Far East. Based on a structural and semiotic analysis of ritual plastics - an extensive set of idols and amulets made in the late XIX - first half of the XX century. and stored in museums in St. Petersburg, Primorsky and Khabarovsk Territories and the Sakhalin Region, the author for the first time in ethnological science reveals and traces the role of sacred numbers in healing magic.