When it comes to running a successful garage sale, Sarah Winston believes in doing her homework. She also believes in giving back. But when she agrees to manage an athletic-equipment swap, she doesn't bargain on an uncharitable killer. The day of the event, the school superintendent is found dead in the gymnasium. Suddenly, the murder suspects are the school-board members—including the husband of a very difficult client who's hired Sarah to run a high-end sale and demands she do her bidding. In between tagging and haggling, Sarah studies the clues to see who wanted to teach the superintendent a lesson. But as she closes in on the truth, the killer intends to give her a crash course on minding her own business.