A young couple travels to Sweden to visit their friend’s rural hometown and attend its mid-summer festival. What begins as an idyllic retreat quickly descends into an increasingly violent and bizarre competition at the hands of a pagan cult.

After their reclusive grandmother passes away, the Graham family begins to unravel cryptic and increasingly terrifying secrets about their ancestry. The more they discover, the more they find themselves trying to outrun the sinister fate they seem to have inherited.