A snarling dog can sense our fear, no matter how much we try to conceal it - and so can an expert poker player studying us from across the table. In each case we betray ourselves through cues so slight we're often completely unaware of them: the beat of the pulse at our neck, the blink of an apparently steady eye, an ever-so-slightly elevated tone of voice...In the jargon of poker, such giveaways are called "tells", and they can be worth a lot of money to the player who knows how to use them. Surprisingly, there's still only one book published that explains how to use them in detail, and that book is 20 years out of date. Hence, "Ultimate Guide to Poker Tells".