A new work by the classic children's literature Vladislav Krapivin, “Butterfly on a Barbell,” is the final work in the “Hair of Steel” trilogy. In the center of the city, away from the noisy streets, in an old wooden mansion there is a cafe “Artseulov”, in which a door to other worlds can open. The heroes of the book, together with new friends, are trying to understand the laws of harmony of the Universe and make the lives of those around them better. The collection also includes the story “Jumping,” which tells about the life of children in a seaside village located near the border of once friendly countries.