A teenager is murdered in the woods of Hemlock Grove. Evidence points to an animal attack but suspicions soon fall on Peter, the newly arrived gypsy.

Roman confronts Peter at the crime scene, finding common ground. Letha reveals a shocking secret and Olivia and Norman fall into old habits.

Christina discovers a new victim and Sheriff Sworn gets outside help from Dr. Chasseur. Now a suspect, Peter joins Roman to find the killer.

Peter and Roman follow Lisa Willoughby's trail to the old steel mill where they find a missing piece of the puzzle. Christina's date goes poorly.

Shelley commits an act of independence, Chasseur questions Roman but crosses paths with Olivia, and Peter and Roman's friendship takes a turn.

A weakened Roman emerges from his coma and reunites with Peter to stop the killer. Hemlock Grove braces itself for another lethal full moon.

Peter and his mother hide from vigilantes seeking the killer, while Christina disappears, and Roman finally begins to face the truth about his nature.

Peter explores the scene of his haunted premonitions. Meanwhile, Olivia demands exclusivity from Norman at all costs.

Roman’s hunger tempts him beyond his self-control. New evidence arises in the search for Shelley. Peter comes to the aid of a child in need.

While Peter undergoes questioning, Roman proceeds with his final transfusion. An unexpected alliance forms when a threat to Olivia’s life is revealed.