After Arthur calls Francine a hurtful name, she refuses to speak to him. Then Mr. Ratburn pairs them up for a homework project. They reluctantly go to the library for research and find themselves locked in once the library closes. Will Arthur and Francine set aside their differences and work together to find a way out? In chapter-book format, for children who are ready to read on their own, this suspenseful adventure will surely be a hit among Arthur fans.