The Davison family reunites at their remote vacation home to celebrate the wedding anniversary of their parents, Paul and Aubrey. Adult siblings Crispian, Drake, Felix, and Aimee, along with their significant others, gather for what should be a rare occasion of togetherness. Tensions and old resentments surface during dinner, exposing the family's dysfunctional relationships. Joyful celebration quickly turns to horror, however, when a group of mysterious assailants wearing animal masks suddenly attack the house with crossbows and other weapons, intent on killing everyone inside.

One of the guests, Erin, whose survivalist background has equipped her with unique skills, takes charge in the dire situation, attempting to outmaneuver the attackers. As the family scrambles to defend themselves against seemingly prepared and vicious opponents, underlying secrets among the family members begin to unravel. Terrified and desperate, the Davisons must pull together to survive, even as trust within the family starts to crumble, setting the stage for a tense and bloody struggle for survival.