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.
We see a murder-suicide scene. A car was left running - and the smoke directed to the house. A young woman and an couple are all seen dead. We hear the surviving sister crying uncontrollably.