The Magician's Nephew by C.S. Lewis

The Magician's Nephew by C.S. Lewis is the first, chronologically, anyway, in the Chronicles of Narnia. Friends Diggory and Polly are trying to do some exploring in the attic of the townhouse in which they live when they accidentally stumble upon Diggory's weird uncle in his attic study. Some funny yellow and green rings on a tray catch Polly's attention, and when she touches one, she suddenly disappears, much to Diggory's horror, and his uncle's amusement! What Diggory does to rescue her leads into the rest of the story involving a dying world, an evil queen, and the birth of a wonderful series! If you enjoy middle grade fantasy with strong Christian metaphors, you will enjoy the Chronicles of Narnia, in particular, The Magician's Nephew!

The Magician's Nephew was first published in 1955.