Dorothy May loves playing tricks on her sister Petey which twist her mind. After discovering how naive Petey is, Dorothy May's "pranks" cause Petey to scare the kids at school, leading to her suspension, but Dorothy May isn't done with her yet and is preparing for her next big pranks for Petey's birthday party. However, she is visited by the ghost of a skeleton who warns her to not go too far otherwise she'll be the butt of the joke.
—D. Alistair-Years