The Lion, the Witch and the Wardrobe

"In reality however he (Aslan) is an invention giving an imaginary answer to the question, "What might Christ become like, if there really were a world like Narnia and He chose to be incarnate and die and rise again in that world as He has actually done in ours?" (C.S. Lewis in a letter to a Friend)
This is the premise to the very first book about Narnia-the most famous and beloved book in The Chronicles-the one that started it all: The Lion, the Witch and the Wardrobe. (It became known as Book Two when The Magician's Nephew was released, and publishers decided to renumber the series according to the chronology of the stories themselves.)
A little less than a month before he died, Lewis wrote the following letter to a little girl named Ruth. Somehow his words seem a fond and fitting farewell to all of us, his devoted readers.
Dear Ruth,
Many thanks for your kind letter, and it was very good of you to write and tell me that you like my books; and what a very good letter you write for your age!
If you continue to love Jesus, nothing much can go wrong with you, and I hope that you may always do so. I'm so thankful that you realized the "hidden story" in the Narnian books. It is odd, children nearly always do, grown-ups hardly ever.
I'm afraid the Narnian series has come to an end, and am sorry to tell you that you can expect no more.
God bless you.
Yours sincerely,
C.S. Lewis