Title: The Pumpkin Principle
Subtitle: (#4)
First published: August 12, 1986
Description: It's almost Halloween and the girls get caught up in romance & a real life ghost story. The twins are excited about the upcoming Halloween Dance at school. They begin match-making among their friends and then are surprised to find out that they both have a date with the new guy in school, B.J. Wilkins. The twins come up with an identity-switching surprise for B.J. the night of the dance, only to be surprised themselves.