Arthur had a job to collect coins for Mrs. McGrady to raise money for a new dog for the Elwood City firemen, and when he left the bag of quarters where Mrs. McGrady was working, she said she never received them. While this was happening, Buster opened his detective agency, he has no idea his first job will involve Arthur. Now, it is up to Buster to solve this mystery, was Arthur the real thief?....

Buster's grades aren't as good as his jokes, and now he is on the verge of repeating his third grade year. If he does not receive at least a B on his next test, he fails...

Arthur is lonely when Buster starts spending time with a new super-cool friend named Mike.

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Arthur throws a sleepover and invites Brain and Buster. He doesen't invite D.W. so she decides to ruin the sleepover.

Buster saves a cat from up a tree and now he is known as a local hero because of an article in the newspaper.

Everyone has all pledged not to watch TV for one whole week.

Buster feels left out having missed all the adventures since he was away. He feels that everyone has changed and they feel the same about him, so Arthur plans a party so they can rekindle their friendship with Buster.

When Buster signs up to sell candy for the band, he figures it's easy money. Buster soon wishes that somebody loved chocolate more than he does, because he eats it all himself.

Buster is convinced that he's seen real UFOs, and he uses Muffy's fancy new telescope to get the proof.

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A new candy bar that Buster wants to try is making anyone who eats the candy bar act strange.

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