The series contains many allusions to traditional Christian ideas, presented in a format designed to make them easily accessible to younger readers; however, the books can also be read purely for their adventure, colour, and richness of ideas, and as a result have become favourites of children and adults, Christians and non-Christians alike. (They had, for example, considerable success in their Israeli Hebrew translation.) In addition to employing Christian themes, Lewis also borrows characters and ideas from Greek and Roman mythology, as well as from traditional British and Irish fairy tales.
The Chronicles of Narnia present the adventures of children who play central roles in the unfolding history of the fictional realm of Narnia, a place where animals talk, magic is common, and good battles evil. Each of the books (with the exception of The Horse and His Boy) feature as their protagonists children from our world who are magically transported to Narnia, where they are called upon to help the lion Aslan set some wrong to right.