Who knew a new sports field could cause so much drama? That's what Nancy, Bess, and George are investigating. Ever since George's cousin Carrie Kim announced her candidacy for city council, along with her platform of building a new football field and a state-of-the-art sports complex, someone has been trying to sabotage the campaign!

Nancy has to go undercover as a member of the Green Club when she suspects they may be behind all of the mischief. When Carrie starts getting threatening notes and even some more sinister warnings, Nancy knows she needs to crack the case before someone gets hurt!