The pumpkin principle

"Is the decaying Victorian mansion on Crabtree Hill really haunted? Identical twins Chris and Susan Pratt decide there's no time like Halloween to find out. Then another mystery arises: what to do when they both fall for the same boy. A third mystery: how to make the annual Halloween Dance special. The girls encounter unexpected tricks and treats as they cleverly solve all three mysteries. Young Adult Fiction by Cynthia Blair; originally published by Fawcett Juniper"@en
"The Pratt twins are at it again. It's almost Halloween and the girls get caught up in romance and a real life ghost story in this book. 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."@en