The story starts with the hero, Kirill, being "erased" from daily life in present-day Moscow. Everybody forgets him (even his parents and dog), another person lives in his apartment, all IDs and files in all offices disappear. After a while he is phoned and invited to an old water tower — but inside is his future home and working place. There it is revealed to him that he is able to open doors, leading to other worlds — although at first all but one are locked. Once opened each door becomes rigidly connected to some world, but which one can't be predicted. All of the worlds have mostly similar environments and seem to be on the planet Earth but the societies and people are different.