After Arthur called Francine a marshmallow, Francine and her friends get really mad and it looks like they are going to fight. But when they both get locked inside the Elwood City Library they either have to make up, or prepare for a long and scary weekend, because it's the weekend and the library closes until Monday.

Arthur's dream is to have Moon shoes, but he does not have the ten dollars to get them. When he begins working chores to receive money, he got too desperate and does something he will regret.