The Magician's Nephew
Polly Plummer appears in "The Magician's Nephew" and "The Last Battle". She is the next-door neighbour of the young Digory Kirke. She is tricked by a wicked magician (who is Digory's uncle) into touching a magic ring which transports her to the Wood between the Worlds and leaves her there stranded. The wicked uncle persuades Digory to follow her with a second magic ring that has the power to bring her back. This sets up the pair's adventures into other worlds, and they witness the creation of Narnia as described in "The Magician's Nephew". She appears at the end of "The Last Battle".