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.

We don't have an overview translated in English. Help us expand our database by adding one.

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

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.