When a dangerous new troll unleashes devastation across their homeland, Nora, Andreas and Major Kris embark on their most perilous mission yet.

Detectives Sander Holm and Max Sørensen are investigating a strange case in which four boys are found dead. Soon, both are haunted by horrible nightmares, and have to ask themselves what they are actually hunting.

A marine biologist is doing research on a fish farm when she encounters several strange occurrences. Along with the brutal deaths of two teenagers, all signs point to the deep fjord; can there be more to the depths than the eye can see?