At the recently reopened Camp Grey-Pine in Maine, a group of young counselors arrives to kick off a new summer season, excited to revive the once-abandoned grounds with laughter and adventure. Unbeknownst to them, they awaken the vengeful undead groundskeeper, Elijah Blackwood, who seeks retribution for a dark betrayal. The counselors' idyllic retreat quickly turns into a relentless nightmare of terror and survival.