Several friends travel to Sweden to study as anthropologists a summer festival that is held every ninety years in the remote hometown of one of them. What begins as a dream vacation in a place where the sun never sets, gradually turns into a dark nightmare as the mysterious inhabitants invite them to participate in their disturbing festive activities.

In postwar Germany, an American psychiatrist must determine whether Nazi prisoners are fit to go on trial for war crimes, and finds himself in a complex battle of intellect and ethics with Hermann Göring, Hitler's right-hand man.