The Magician’s Nephew by C.S. Lewis

The secret passage to the house next door leads to a fascinating adventure. Narnia... a land where the woods are thick and cold, where Talking Beasts come to life—an entirely new world where adventure begins. One cold, wet summer in London, Digory and Polly meet and become fast friends. Their lives take a sudden turn when Digory’s Uncle Andrew, who fancies himself a magician, sends them hurtling to... somewhere else. They arrive in Narnia, just as it is born from the song of the great Lion, Aslan. Along the way, they encounter the evil sorceress Jadis, whose dark magic threatens everything. After a whirlwind adventure, they finally find their way back home.