When a boy's parents tell him they buried a great treasure in the backyard, he decides to dig it up.

What he's not expecting to find is the skeleton of his great-great-grandmother! She scolds him for not recognizing her. Also, she might smell a bit. It takes time to clean all the bones, and even more to put her back together. Then it's time for Great-Great-Grandmother and the boy to go exploring. Where did she get that airplane? Or that motorcycle? After their joyrides and partying all night, Great-Great-Grandmother only has one last request: a tasty glass of lemonade. At last, she's ready to go back to her final resting place. But the boy will never forget the time they spent together or the feeling of making his great-great-grandmother proud.