Mrs. Chesterfield throws a rooftop Halloween party, but she does not invite Jessie and the Ross children so they decide to have their own. But their festivities take a haunting turn when Jessie begins to see ghosts and Emma, Luke, and Mrs. Chesterfield are possessed by ghoulish spirits. Now, it is up to Jessie, Ravi, and Zuri to defeat the ghosts and save the day and their building.