Less than one month before he died in 1963, C. S. Lewis wrote the following letter to a young girl who wanted to know if any other Narnia books were going to be produced. It turned out to be a fond and fitting farewell to all of 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 Narnia books. It is odd, children nearly always do, grown-ups…hardly ever.
I'm afraid the Narnia series has come to an end, and am sorry to tell you that you can expect no more.
God bless you.

Your sincerely,
C.S. Lewis