Steven Wakefield has had it up to here with his twin sisters, Jessica and Elizabeth. Ever since the boys in their class at Sweet Valley Middle School challenged the girls to a Scare War, the twins have been driving him crazy: they're busy coming up with schemes to scare the boys -- and they're testing them all on Steven!

So when the twins and their friends have a slumber party, Steven figures he's really in for it -- who knows what kind of stunts the girls will pull? But Steven's got some spooky plans of his own. One way or another, he's going to outscare them all!