Polly and pals must stop Griselle's mayoral quest to put Littleton in a dome, but their efforts are hampered by Polly's locket being on the fritz. Polly must team up with newcomer Nicolas to repair the locket to defeat Griselle.

In an effort to scare Pierce the girls enlist Nicolas to orchestrate a "paranormal event." When Pierce contacts a Paranormal Investigator, the girls must stop her from discovering the locket's power. Can they stop her before their secret is exposed?