Arthur's friend Buster is searching for a crime to solve. When the quarters Arthur has collected for Mrs. MacGrady's charity drive mysteriously disappear, Buster is committed to cracking the case.

When Arthur finds Sue Ellen's lost diary at the library, he wonders whether or not to read it before he returns it to her.

When a parent group bans a series of scary books from the local public library, Arthur and his friends devise a plan to get their favorite books returned.

Arthur and his friends are thrilled to learn that the rock group BINKY is giving a concert in their town.

When Arthur's third-grade class goes hunting for fossils at Rainbow Rock State Park, Buster actually finds one. The problem is, he wants to keep it. Can Arthur persuade Buster to return the important discovery, or will it stay buried forever in the back of Buster's closet?

When Arthur and his friends ride their bikes to school, Francine is embarrassed by her old hand-me-down bicycle. But when she reports her bike is stolen, her friends rally to find the thief. Will they discover the true fate of Francine's bicycle?

At Prunella's half-birthday party, her sister unveils a fortune-telling cootie catcher that seems to be able to predict the future.

Arthur and his friends help Buster study for an important test so that he will be able to move on to the fourth grade with them.

Brain and Francine devise the perfect plan to get even with Muffy after she bribes the judges at the science fair.

Arthur is looking forward to having his friend the Brain spend an entire weekend at his house, but then the Brain shows up and starts acting a little too much like the perfect family member.