"... the nuns of Montglane Abbey are forced to unearth a secret buried for a thousand years within their fortress walls. As the women scatter across the world they take with them the pieces of a mystical chess set given to Charlemagne by eight mysterious Moors. Embedded in each piece of chess service is a code. Whomever reassembles the pieces can play a game of unlimited power - a game that will bring about the end of all kings."
Or so it says here.