The Fairyland series

The Fairyland series consists of five books written by Cathrynne M. Valente describing the adventures of September Morning Bell.

The Girl Who Circumnavigated Fairyland
Twelve-year-old September lives in Omaha, and used to have an ordinary life, until her father went to war and her mother went to work. One day, September is met at her kitchen window by a Green Wind (taking the form of a gentleman in a green jacket), who invites her on an adventure, implying that her help is needed in Fairyland. The new Marquess is unpredictable and fickle, and also not much older than September. Only September can retrieve a talisman the Marquess wants from the enchanted woods, and if she doesn't...then the Marquess will make life impossible for the inhabitants of Fairyland. September is already making new friends, including a book-loving Wyvern and a mysterious boy named Saturday.

The Girl Who Fell Beneath Fairyland
September has longed to return to Fairyland after her first adventure there. And when she finally does, she learns that its inhabitants have been losing their shadows - and their magic - to the world of Fairyland Below. This underworld has a new ruler: Halloween, the Hollow Queen, who is September's shadow. And Halloween does not want to give Fairyland's shadows back.

The Girl Who Soared Over Fairyland
September misses Fairyland and her friends Ell, the Wyverary, and the boy Saturday. She longs to leave the routines of home, and embark on a new adventure. Little does she know that this time, she will be spirited away to the moon, reunited with her friends, and find herself faced with saving Fairyland from a moon-Yeti with great and mysterious powers.

The Boy Who Lost Fairyland
When a young troll named Hawthorn is stolen from Fairyland by The Golden Wind, he becomes a changeling - a human boy - in the strange city of Chicago, a place no less bizarre and magical than Fairyland when seen through trollish eyes. Left with a human family, Hawthorn struggles with his troll nature and his changeling fate.

The Girl Who Raced Fairyland
All the lost Queens and Kings of Fairyland are back, and there’s to be a race to decide who gets the crown (and all attendant duties). All of our friends are back as well – our best wyverary A-Through-L, the dear Marid Saturday, the changelings Hawthorne and Tamburlaine, and, of course, the wombat Blunderbuss and the gramophone Scratch. September’s parents are even invited to this last mad dash through the wonders of Fairyland!