Angelina Fandorina had no friends. And why should they, when you have the best brother in the world? But Erast, called Eraser at home, is transferred to a mathematical lyceum, and Gelya is left alone. She is saved by a strange acquaintance and stunning news: only she, an ordinary Moscow sixth-grader, can save the world! But to do this, she will have to move into the past, and someone else’s!.. An incredible continuation of the “Children’s Book”, written by Gloria Mu based on the script by Boris Akunin!