Tomorrow is the girl Arina’s birthday. She can't sleep, she dreams of riding a unicorn. At least in a dream! But the dream still does not come... Suddenly, her dreams are interrupted by the creak of an opening door, in the opening of which she sees an unfamiliar boy with a burning candle in his hand... Burning with curiosity, the girl without fear invites a strangely dressed stranger into her room. Alexander - this is how the young man introduced himself, tells Arina that he lives here with his family and servants (what nonsense!), and invites her to his home library. A skeptical girl follows him and, leaving her room, finds herself in an unfamiliar room...