After reading a few books about books, and they contain books about mysterious doors, you definitely did not expect to find yourself in front of such a painted door. Moreover, they did not expect to cross them.

"Come on, breathe. Breathe, it's all right. Yes, yes, keep going."

You woke up after falling down a steep staircase, hitting your head. All around you were huge bookcases instead of walls and planets and stars painted with a brush on the ceiling while a guy near tried to help you