When photographers Erin and Patrick are brought aboard the ship with their young son Lukas, they unleash a series of events that entwines their family with the ship’s dark past. As the terror unfolds around them they begin to realise there is more to this sumptuous ocean liner than meets the eye: its remarkable legacy masking violent secrets.

During a wild night of debauchery, a gang of vengeful women plot to massacre a monastery full of corrupt monks who sold their loved ones as slaves. Their plan comes unstuck when a gang of marauding Vikings arrive with an army of vicious, tree-like demons on their tail..