When the world begins to collapse, tech billionaire Colin Lumas gathers his family, a handful of scientists, and what remains of his empire in an underground sanctuary. Beneath layers of steel and constant surveillance, he's determined to complete his greatest achievement: a breakthrough in insect biology that could unlock the secret to immortality.

Among the survivors are Colin's three daughters: Zoe, the eldest, who spent her whole life protecting others and building the safe, ordinary family she never had; Vie, the middle child, who embraced her father's hunger for attention, control, and admiration and transformed it into a career as a ruthless social media influencer; and Enid, the estranged bastard child, who has been mysteriously called back into her father's life as his newest obsession.

Trapped together in their father's final monument to his own brilliance, the sisters soon realize they are not any safer here than outside. When Colin's work comes to life-literally-leaving behind a trail of bloody carnage, they are forced to reckon with the haunting realization of why they were all brought here and what exactly their father is willing to sacrifice to preserve his legacy.