Sarah finds herself at the center of a series of copycat killings and visits the man who murdered her parents in prison and he imparts a cryptic message.

Sarah receives a gruesome package at her new gallery. The Executioner exacts justice on citizens of Waterbury. Sarah attempts to decipher a message in her parcel. Sarah's grandmother pleads with her to leave town.

A disturbing secret from Sarah's past confirms her belief that the police have arrested the wrong person for the murders.

Sarah believes the killer is using the seven deadly sins as part of their plan and is disappointed by the police chief's lack of responsiveness. Unfortunately Sarah's attempt to investigate the murders leads to misfortune.

Sarah blames herself when another disturbing murder occurs. Meanwhile Allison has mixed reactions to Dylan's TV commentaries about the killings.

Sarah learns of some unsettling information about her past from Tom Winston, which leads her to believe she knows the next target of the Executioner.

Convinced that Sarah is The Executioners final target, Tom Winston escapes from prison. Also Sarah discovers that Dylan knew about her past prior to meeting her.

The Executioner plans one last act of retribution while Sarah is comforted by Cam after Dylan's dishonesty.

Five years after concealing a murder, guilt-stricken summer camp counselors return in midwinter to the scene of their crime, now a utopian commune.

After a body is found and a guest vanishes, both groups discover they're trapped at the camp with communication to the outside world cut off.

As the list of victims continues to grow, the number of possible suspects narrows and the two groups are forced to cooperate despite mutual suspicion.

The histories of several characters unfold in flashback, revealing surprising connections, while an innocent hiker is pulled into the unfolding drama.

The gruesome past and false identity of a commune member is discovered, although it may be too late to save the fellow camper they have kidnapped.

Desperate to discover the identity of the killer preying on them, the remaining survivors reluctantly conduct a mock hearing to learn the truth.

Misinterpreted evidence points everyone in a false direction, while one camper finds evidence that makes him question the motive behind the slaughter.

The serial killer confesses to another camper, but the rest of the stranded survivors are still in the dark as final twists and truths are divulged.

On the first anniversary of a mysterious slaying, the masked killer responsible strikes again, butchering one of the earlier crime's eyewitnesses.

Connections to Kit are revealed in flashbacks, while a couple's secret affair is exposed via social media and another slaying strikes the community.

As school is dismissed for the summer, more shocking memories from the past year surface and a teacher who tries to be an ally to Saadia pays a price.

The Druid kills again as Amy recalls her role in Kit's death, Roberta questions multiple witnesses, and plans get underway for the solstice party.

Roberta and Pujit identify a suspect while Violet's lurid, exploitative murder blog goes too far, making her and Joe targets of outrage and revenge.

Attendees of the solstice party are stalked by the Druid while someone engineers a violent confrontation in the basement between Angel and Dan.

Angel and Dan desperately try to escape, Roberta and Pujit get too close to the Druid, and Saadia grows closer to Connor in the hours after the party.

With the identity of the Druid revealed, the few remaining survivors inside the apartment building must make a last-ditch fight for their lives.