An American couple visiting Sweden for a midsummer festival find their idyllic retreat quickly devolving into a bizarre competition at the hands of a sinister pagan cult.

Two tourists are found dead in a tent near the small Swedish town of Blackwater. The repercussions of this unsolved crime continue to affect the town's residents for years to come.

When a Nordic Airlines flight to the USA is hijacked, a team of Swedish investigators must race against time to unmask the mysterious hijackers before they bring the airplane down or the US military shoot it out of the sky.