Authors:

The incredible thing happens at the beginning of the story always, you notice, not the end. A Sherlock Holmes story is never a trick story.

" Invitation to Learning" with Jacques Barzun and Elmer Davis; transcript in "The New Invitation to Learning: The Essence of the Great Books of All Times", book by Van Doren (1942), page 246, January 1942.
The incredible thing happens at the beginning of the story always, you notice, not the end. A Sherlock Holmes story is never a trick story.