Case of the Captured Queen

River Heights is the site of a major international chess tournament. Two of the best young players in the worldGreta van Leeuwen and Donna Winstonare set to face off in a battle of wits and nerves. But as Nancy soon discovers, the action isnt just on the game board. First, someone deliberately ruins the opening ceremony. Then Gretas sister mysteriously disappears! Greta must win if she wants to se...