More like Suddenly Twins!

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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
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
The Ship of IshtarNovel
A. Merrittstandalone novel1926
Mythic fantasy, about gods.
“When he finally manages to crack open the rock, a mist escapes.”
from the catalogue
Dwellers in the MirageNovel
A. Merrittstandalone novel1932
About witches.
His Dark MaterialsUniverse
universe13 books1995
About coming of age.
“In a world like ours and unlike it, every human soul walks outside the body in the shape of an animal — a daemon, who speaks, who cannot be lied to, and who settles into one fixed form only when childhood ends.”
from the catalogue
Start with Northern Lights →
includes His Dark Materials, The Book of Dust
Five KingdomsSeries
series5 books2014
Set in secondary world.
“After Cole sees his friends whisked away to some mysterious place underneath the haunted house, he dives in after them—and ends up in The Outskirts.”
from the catalogue
Start with Sky Raiders →