A criminal lady named Maria Ladrones and her husband who is just a hand, (named Milo Ladrones) comes to Muriel's house when the TV needs fixing. Eustace goes in the van to watch their TV. For fun, Mariah says, she makes her hair like Muriel's and dresses up like Muriel. She steals Muriel's gift certificate and everything. When Mariah and Milo steal a diamond the police think Muriel did it because Mariah looked like Muriel. Courage must clear Muriel's name.