Marine biologist Johanne is conducting research at a fish farm in the quiet fjord-side village of Vangsnes when unsettling events begin to unfold. After two local teenagers are found brutally killed, every clue leads back to the dark, unfathomable waters. What secrets lie hidden beneath the surface? Deep at the bottom of the fjord stirs a legendary creature—massive as a mountain, its countless arms poised to seize and destroy anything within reach.