Book-Advanced Fly Tying by A.K. Best-HC, In his fourth book on the subject, author A. K. Best offers a thoughtful interpretation of advanced techniques for tying trout flies. In A. K. Best 's Advanced Fly Tying , A. K. discusses tools, materials, and methods in elaborate detail, and the resulting fly patterns "may, in the right hands, fool a few more trout," according to John Gierach's introduction. Hardcover edition. 248 pages.