More like The First Adventure

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FairylandSeries
series7 books2009
Whimsical in tone, about quests.
“The novels follow a 12-year-old girl named September as she is spirited away from her average life to Fairyland.”
from the catalogue
Start with The Girl Who Circumnavigated Fairyland in a Ship of Her Own Making →
InterWorldSeries
series3 books2007
Science fantasy and science fiction, set in parallel universe.
“Michael Reaves developed the story with Neil Gaiman, and Reaves's daughter Mallory Reaves co-wrote the two sequels.”
from the catalogue
Start with InterWorld →
Songs of Earth and PowerSeries
series2 books1984
completed
Fantasy, about fae, set in contemporary.
“The sequel, The Serpent Mage, continues Michael's story in that world.”
from the catalogue
Start with The Infinity Concerto →
Un Lun DunNovel
China Miévillestandalone novel2007
Whimsical in tone, about chosen one, set in otherworld and big city.
“The title is derived from 'UnLondon,' the name of the alternate realm where the book is set.”
from the catalogue
NarniaUniverse
universe38 books1950
Set in secondary world.
“Once there is a wardrobe at the back of a spare room, and behind the fur coats the wood gives way to snow, and a lamp-post burns alone among the trees.”
from the catalogue
Start with The Lion, the Witch and the Wardrobe →
includes Narnia, Narnia Solo Adventures
Faerie WarsSeries
series5 books2003
completed
Portal fantasy and fantasy, adventurous in tone, about fae, set in fairyland.
“As of 2011, there are five books in the ongoing series.”
from the catalogue
Start with Faerie Wars →