The Four-Dimensional Bookstore

You walk into an M.C. Escher design, with staircases that go nowhere and everywhere at once, doors that appear too small for a person to walk through, and more stories on the inside than there appeared to be on the outside.
Millions of books line the shelves, and a few of them catch your eye. Titles include The Summoning of Dragons, The Cordat, Practical Applications of Brainwashing, Plumbing and Unified Field Theory...

This is no ordinary bookstore.

To the right is a fireplace, with an old fashioned tea kettle on the roaring fire. In front of it is a rug coated with silver hairs, as if a very large dog uses it for a bed. Comfortable red leather chairs by the fire offer a place where a customer can sit and read the book of their choice. Opposite the door is a large golden oak counter, big enough to sleep on. Behind it, the walls are lined with magical books. Faint traces of blue energy crackle from spine to spine.

The woman behind the counter is idly leafing through one of the millions of books at her disposal. She smiles when she sees you, and beckons you in. She seems friendly enough.

Behind you is the door