The most popular sorority, Kappa House, is ruled by Chanel Oberlin's iron fist until Dean Cathy Munsch steps in; a devil-clad killer wreaks havoc on campus.

When anti-Kappa DEAN CATHY MUNSCH decrees that sorority pledging must be open to all students, and not just the school’s silver-spooned elite, all hell is about to break loose, as a devil-clad killer begins wreaking havoc across the campus.

Chanel finds a new project in Hester, Chanel #3 confesses a secret and Grace and Zayday uncover a surprising connection between two fellow students. Meanwhile, Denise sets her sights on one of the Kappas, and Dean Munsch appoints a new Wallace University mascot as Chad and Earl Grey lead the fraternity on a witch hunt for the Red Devil.

As Halloween approaches, Chanel creates a devious plan after Zayday makes a shocking announcement. Meanwhile Grace and Pete pay a visit to a mysterious woman with ties to Kappa’s past. Also, Hester grows closer to Chad, Denise continues her search for the red devil killer and Dean Munsch does everything in her power to keep Wallace University open.

With Halloween just days away, Dean Munsch makes an announcement affecting the campus and, specifically, Chanel’s plan to throw a pumpkin patch party in support of her Kappa Kappa Tau presidential campaign. Meanwhile, Grace and Pete lead a search party for a missing friend, which steers them closer to the Red Devil than ever before, and Chanel #3 and #5 learn what life would be like without Chanel.

In an attempt to protect herself from the killer, Chanel makes a surprising decision, which leaves Zayday in a position of power. To stay close to each other, the girls of Kappa Kappa Tau host a slumber party, but when a shocking discovery is made, not everyone will survive the night.