This is an interesting question. It made me think of a fairy tale, actually. I thought of “Hansel and Gretel” because the kids were on an adventure and got lost, but they encountered an evil witch and had to outsmart her and fight her.
The Lion, the Witch, and the Wardrobe is story about the war between good and evil. The main characters, the kids who are visiting, find themselves in a world in which good and evil are very clearly defined. It isn't always that way in real life. Many stories intentionally blur the line between good and evil, but C.S. Lewis is creating and allegorical story that can be applied to our lives in a general way as we decide whether to follow God or Satan.