More like The Five Children

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Tolkien's legendariumUniverse
universe163 books1923
Set in secondary world.
“Before the seas were bent and the mountains raised, there was Music — and from that Music came Arda, and in the west of Middle-earth the long defeat and stubborn hope of those who dwell there.”
from the catalogue
Start with The Fellowship of the Ring →
includes The Hobbit, The Lord of the Rings, The History of Middle Earth, The Fall of Gondolin, The History of the Lord of the Rings
Five Children UniverseSeries
series27 books1902
completed
Set in early 20th century.
“Neither book is by Nesbit herself, and the two have no direct connection to each other beyond both drawing on her creation.”
from the catalogue
Start with Five Children and It →
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
The Wildwood ChroniclesSeries
series3 books2011
Set in contemporary.
“Praised for its illustrations and old-fashioned book design, the trilogy continues across Under Wildwood and Wildwood Imperium.”
from the catalogue
Start with Wildwood →
SummerlandNovel
Michael Chabonstandalone novel2002
Set in parallel universe and contemporary.
“Summerland weaves elements of a World Series, parallel-universe road trip, and a hero's odyssey.”
from the catalogue
The Phantom TollboothNovel
Norton Justerstandalone novel1961
Funny in tone, set in otherworld.
“A journey through a land where Milo learns the importance of words and numbers provides a cure for his boredom.”
from the catalogue