Archaeologists Pippa Quinn and Charlie Jackson find advanced technology in undisturbed 16th Century graves. A portent, the discovery precedes thousands of giant sinkholes opening up across the globe as extreme weather threatens the population. Charlie suspects the two are related. A centuries old plan unfolds. Pippa, Charlie, and the rest of humanity will have to fight for survival, sacrificing the life they’ve known to protect Earth from an ancient and previously dormant enemy. Even that might not be enough as this new enemy exacts a plan that will change the course of humankind forever. Critical Dawn is an apocalyptic ride to the very edge of human existence. Factions will battle for control of the Earth—if they can avoid the threat of extinction.

    When the two ships collide and a suspicious explosion sends both ships to the bottom, the crews take refuge on what they think is a peninsula attached to the mainland, but is actually an island, recently freed from a glacial ice bridge. Seeking shelter, the two opposing crews scour the island for resources. Instead, they find Viking artifacts, the preserved remains of an ancient structure and a stone totem warning of horrible creatures buried in the island's caves. Facing violent, frigid storms, a hungry polar bear and the very real possibility that they are stranded without hope of rescue, Jane Harper leads the two crews, who must work together to defend themselves against an ancient evil upon which the modern stories of both zombies and vampires are based. The original undead are awake and hungry. Beware the Draugar.

    Then there is light, there are voices, and they feed... Swarming from their prison, they multiply and thrive. To scream, even to whisper, is to summon death.Deaf for many years, Ally knows how to live in silence. Now, it is her family's only chance of survival. To leave their home, to shun others, to find a remote haven where they can sit out the plague. But will it ever end? And what kind of world will be left?