Arrthur's friend Buster is searching for a crime to solve, so when the quarters Arthur has collected for Mrs. MacGrady's charity drive disappear, Buster is on the case. Will he be able to prove Arthur's innocence so that he can attend the class picnic?

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

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 attends a rock concert in hopes of meeting the famous musical group, Binky.

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.

"When Arthur's third-grade class competes at the Middle Ages Fair they lose at everything. Their only hope for victory is if Arthur can pull a sword from a stone." --

If Arthur and Buster cannot find a way to get Francine and the Brain to stop fighting, their soccer team will never make it to the play-offs.