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 cards and magic written in 1901 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.

The Expert at the Card Table is the most famous, the most carefully studied book ever published on the art of manipulating cards at gaming tables."