A lonely widower stumbles upon a mysterious encrypted message in the personal ads. He deciphers the code and discovers that it's a chess move. He answers in kind and begins playing an innocent game of chess an with an unknown player. Playing the game and getting secret messages start to fill a void in his life. Despite not knowing their identity, he starts to fall in love with his opponent. The game continues and as the messages get more flirtatious, the codes get harder to crack, and he finds himself desperately trying to keep the game going.