Mary (Parker Posey) is a free-spirited young woman with a run-down New York apartment and a high fashion wardrobe. She calls her godmother, a librarian, for bail money after being arrested for throwing an illegal party. To repay the loan, she begins working as a library clerk. At first she hates it, but when challenged decides to master the Dewey Decimal System and become a great library clerk, while romancing a falafel vendor and helping her roommate in his goal to become a professional DJ.