1955 . Two young couples move to the uninhabited, isolated fjord of Hedinsfjörður. Their stay ends abruptly when one of the women meets her death in mysterious circumstances. The case is never solved. Fifty years later an old photograph comes to light, and it becomes clear that the couples may not have been alone on the fjord after all ... In nearby Siglufjörður, young policeman Ari Thór tries to piece together what really happened that fateful night, in a town where no one wants to know, where secrets are a way of life. He's assisted by Ísrún, a news reporter in Reykjavik, who is investigating an increasingly chilling case of her own. Things take a sinister turn when a child goes missing in broad daylight. With a stalker on the loose, and the town of Siglufjörður in quarantine, the past might just come back to haunt them.