A new semester at Crown Lake means it's time for "Heather" to find a new target...but, is Nellie up for the challenge?

Nellie has some second thoughts when it comes to acting as the new "Heather." Meanwhile, Chloe steps in to help Lola after her "secret" is exposed on the tattle wall.

Nellie and Lucy devise a plan to knock Tiffany off her throne. Meanwhile, Lola ruffles feathers on the wrestling team and Josh shares his concerns about Nick's "cures."

Tensions are at an all-time high as Lola challenges a fellow wrestler, Josh confronts Nick about his "services", and Nellie stands up for Chloe against Tiffany's unrelenting bullying.

With Tiffany's secret exposed, Nellie rises up as the new head of the popular girls. Meanwhile, Chloe faces her inner demons as she navigates her feelings about Lola...

Nellie spends detention in the "crypt." Meanwhile, Chloe goes on an impromptu date and the entire school faces backlash when Nick's "study pills" are uncovered.

As Nellie seeks revenge on Miss Rose, Chloe confronts her confusion, and Tiffany's family troubles are exposed -- it's just another day at Crown Lake Academy.

It may be the season finale, but the mystery is far from over. Nellie, Chloe, and Tiffany work together to uncover a long-held Crown Lake secret that could change everything... but, will it be enough to reveal Heather's identity and stop her, once and for all?