Beneath the ruins of a world consumed by a devastating infection, the last remnants of humanity survive within Haven, an underground city carved deep into ancient stone. Aria Voss, a young scientist determined to succeed where countless others have failed, devotes herself to finding a cure for the illness that destroyed civilization. When scouts return with a mysterious survivor named Zero, everything she believes is challenged. Zero has survived multiple bites without turning, making him the key to humanity’s future and the target of those willing to sacrifice anything for a cure. As Aria’s growing bond with Zero forces her to question the morality of the world she once trusted, she must decide whether humanity deserves saving if it forgets what it means to be human.