Deep in the murky waters of Loch Ness, the creature known as Nessie has returned. Twins Natalie and Austin McQueen watched in horror as their parents were devoured by the world's most infamous lake monster. Two decades later, it's their turn to hunt the legend. But what lurks in the Loch is not what they expected. Nessie is devouring everything in and around the Loch, and it's not alone. Hell has come to the Scottish Highlands. In a fierce battle between man and monster, the world may never be the same.