The Expert at the Card Table: The Classic Treatise on Card Manipulation, often referred to simply as Erdnase (or even The Bible), is an extensive book on the art of sleight of hand published in 1902 by S. W. Erdnase, a pseudonymous author whose identity has remained a mystery for over a century. As a detailed manual of card sharps, the book is considered to be one of the most influential works on magic or conjuring with cards.