A couple travels to Northern Europe to visit a rural hometown's fabled Swedish mid-summer festival. What begins as an idyllic retreat quickly devolves into an increasingly violent and bizarre competition at the hands of a pagan cult.

Thale (17) has just moved with her parents to a small town after her mother has a new job in the local police. After a student is killed brutally at a party Thale attends, she becomes a key witness. Was the killer an animal? A wolf?

One midsummer evening in 1973 two tourists are found murdered in a tent. The unsolved crime casts shadows on the lives of several people.