The Gameshouse (The Gameshouse, 1-3) [North, Claire]

Everyone has heard of the Gameshouse. But few know all its secrets...

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It is the place where fortunes can be made and lost through chess, backgammon - every game under the sun. ‚  
But those whom fortune favors may be invited to compete in the higher league... a league where the games played are of politics and empires, of economics and kings. It is a league where Capture the Castle involves real castles, where hide and seek takes place on the scale of a continent.

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Among those worthy of competing in the higher league, three unusually talented contestants play for the highest stakes of all... ."