In the midst of the midsummer celebrations on the island of Gotland, a series of vicious murders take place with occult overtones. A man is found strung up alongside slaughtered animals; another is found sacrificed in his car in the middle of a summer meadow. The holiday paradise is shattered and soon attention falls on an old murder case involving a long-deceased killer that someone is clearly mimicking...

A lawyer on his way home through the sun-drenched Gotland countryside disappears without a trace. An island mink farmer receives a death threat and a sadistic trap is set up on his premises. Two separate events that soon prove to be linked — and from the moment that the first dead body is discovered, it becomes clear that it is just the beginning of something much bigger.