The idea for this book was given to me by my grandson Felix. He, like all curious children, did not pass by a single door, he stood on tiptoe and tried to reach the doorknob. At first, he only reached for it and was very happy, showing everyone look, I can already reach it. I can already reach it, I have grown up and the door handle is in my hands, it brought him great joy. A little later he guessed that the doors could be opened by turning the handle and pulling the door towards him, again a new discovery and childish joy. And he began to open every door, that was in the house. It was for this reason that I had a dream, that he opened one of these doors, but for some reason it was blue door. But what he saw there amazed me. And after this dream, I decided to write a book. Because my grandmother always told me, that there are no coincidences, everything happens for a reason. I thought, what if the reason is that I should write a book. A book about a blue door and a little boy. Thank you, to my beloved grandson Felix, and my grandmother Polina. That's why my book is called "Parallel Planets." And of course, the blue door plays a huge role in this book.