About the book: year / "I got down to business in high spirits. For some reason, the title of the cartoon “The Secret of the Third Planet” stubbornly kept spinning in my head, and my fingers spontaneously clicked on the keyboard: “The Mystery of the Third Entrance.” And I plunged into a detailed description of a mysterious entrance in an old house, where people regularly disappeared, and by all indications this entrance was nothing more than a gateway to another dimension.»