The Magician's Nephew by C.S. Lewis

The Magician's Nephew by C.S. Lewis is a delightful story about how all the comings and goings between Narnia and our own world began.

Though it happened first chronologically in the timeline of the Narnia adventures, it was one of the last books written in the series, and is one of my favorites. Diggory Kirk and Polly Plummer, two friends, find themselves tricked by Diggory's unscrupulous uncle into a magical experiment, and are whisked off on an adventure through multiple worlds, including the doomed Charn, and the new Narnia just being born. This story is a delightful adventure for both children and adults!