About the book: 2009 / An ordinary seventh-grader Kolya, returning from school, finds him on the balcony of his apartment - on the twenty-third floor! - an unfamiliar boy Oleg. He claims that he “fell” while walking along the outskirts of a certain Upper World, carefully disguised and therefore invisible. When Kolya laughs at the stranger, Oleg offers to climb the stairs to heaven together and make sure that the Upper World exists... Thus begins a series of accidents, conspiracies and adventures that will change the lives of the inhabitants of both worlds. And to be able to return home, Kolya must not only find the mysterious List of Forbidden Children, but also learn cruelty and sincerity. In other words, grow up.