Bringing Down the House

by Ben Mezrich

It's a book about some MIT students who learned not only how to count cards in a six deck blackjack deck (I think that's right) but how to coordinate it so that as a team they could compound their winnings. Because it was a system designed to beat the house, the casinos didn't like it one bit when they found out and forced them (occasionally using strong-arm tactics) out of the casinos despite the team doing nothing illegal.