In an isolated village in the Icelandic Westfjords, three friends set to work renovating a derelict house. But soon they realise they are not alone there - something wants them to leave, and it's making its presence felt.

Meanwhile, in a town across the fjord, a young doctor investigating the suicide of an elderly woman discovers that she was obsessed with his vanished son.

When the two stories collide the terrifying truth is uncovered . . .