1 page, 7 x 8 inches, accompanied by the original postmarked airmail envelope, London, April 1, 1960. Written by the British novelist to a reader, in full: "Dear Mr. Rouda, I am afraid I have slipped up. Fortunately the books are being reprinted fairly often, and I shall be able to make the necessary correction before too long. Thank you so much for your help and for your remarks about the series." Natural folds; near fine condition.