In Beacon Heights, a seemingly perfect town, a group of three college friends struggle with the stress of being overachievers. In the aftermath of the town’s first murder, each Perfectionist hides behind a secret, a lie and an alibi.

In the wake of Nolan’s murder, Ava, Caitlin and Dylan join forces to give themselves a credible alibi on the night in question. Alison goes toe to toe with Dana Booker, BHU’s new head of security, who is suspicious of Nolan’s “perfect” posse. And Mona starts slipping into old habits while wrestling with a guilty conscience.

Alison hunts for Taylor, thinking she may be alive and in hiding. Caitlin, Ava and Dylan realize their newfound true friendship is threatened by still buried secrets and debate coming clean to each other. And the Perfectionists try to tighten a noose around their number one suspect.

During BHU's Dead Week, Caitlin tries to get her academic life in order, as well as elevate her relationship with Jeremy. Ava reluctantly teams up with Zach on a school assignment and Dylan's nerve damage impacts an important music project. Ali continues to make inroads with Taylor, while Mona investigates who left her a mysterious message.

On the night of a school gala, the gang is convinced they know who killed Nolan and set out to prove it. However, Dana continues to complicate their lives by exposing a critical secret between the Perfectionists.

In the aftermath of a shocking event, Ali, Mona and the Perfectionists try to pick up the pieces of their lives. However, new information is uncovered which makes them question everything they think they know.