Mercurial billionaire Tuttle Barrows prepared for everything—even the end of the world. Years ago he wielded his immense power and fortune to build a massive sealed habitat atop a once protected ancient freshwater glacial cave. Now, as the world outside unravels, Barrows, his family, and a handpicked inner circle retreat to their final sanctuary—a place built to outlast civilization itself. But something was already there. Beneath layers of ice, in the ancient freshwater vault, a long-dormant danger lurks. While hallucinations twist their reality and violence spreads like a fever they must descend deeper or risk their last refuge becoming a tomb.
