When Arthur's third-grade class goes hunting for fossils at Rainbow Rock State Park, his friend Buster actually finds one, and instead of turning it in Buster decides to take it home--but he soon regrets his decision.
Although Arthur and Francine aren't speaking to each other, they must find a way to set aside their differences when they are locked in the library after it closes.
Arthur worries that he won't be able to play little league baseball as well as all his friends and faces lots of teasing until someone discovers teamwork.
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