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.

Shelley's connection to Dr. Pryce is further revealed, Destiny helps Peter understand the recent murder and the gala at the Tower goes horribly awry.

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.

After drunkenly attacking the Godfrey Institute, Roman falls into a coma and embarks on a subconscious journey of shocking truths and revelations.

As a full moon approaches, Letha's parents discover her relationship with Peter. Despite a crisis of faith, Chasseur prepares to capture the killer.

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.

As Olivia and Chasseur face off at the Mill, Shelley learns the awful truth about her family, and Peter and Roman uncover the killer's identity.

The tragic conclusion to the Hemlock Grove killing spree leaves both the Godfrey and Rumancek families devastated, with the final horror yet to come.