No matter how hard they work, Mary Joy's basketball team can't win a game. But after one of their losses, she and some of her teammates find an old playbook. They use a few of the new plays in their next game, and to everyone's surprise, crush their opponent. But soon each win is followed by an incident of bad luck for the players--a missing pet, a sprained ankle, a car accident--leading them to believe the playbook is responsible. Soon the team decides winning isn't worth the risk. But how can they stop the playbook before it hurts anyone else?