In the new reality of the future, people are prohibited from using electricity - it opens “gaps” through which dangerous monsters from other worlds penetrate into the world. People are forced to survive in the new Middle Ages. Sixteen-year-old girl Kaya is fluent in weapons and dreams of becoming a fighter in the guard, and fifteen-year-old Artyom, who loves to read books, is a real scientist, but they have to leave their home and embark on a dangerous journey in search of a solution to the mystery of the “gaps.” A book with a fascinating plot, written in a bright and lively language, will be of interest to children of middle and high school age.