In a dystopian future, humanity faces a deadly threat following a devastating outbreak of a parasitic fungus that turns most of the population into cannibalistic creatures. Amidst this chaos, a group of special children, who have been infected but retain a surprising level of humanity, is kept in a military laboratory. Among them is Melanie, a bright and curious girl, whose instincts and abilities set her apart from the others.
Melanie's life changes drastically when a surprise attack on the compound forces her caregivers to flee. Together with her teacher, Miss Justineau, Dr. Caldwell—a scientist obsessed with finding a cure—and a soldier named Parks, they embark on a desperate journey through a desolate England. As they try to survive external dangers, the tension between their differing ideologies and Melanie's growing connection to her caregivers becomes the focal point of their odyssey.
As they face danger, Melanie's internal struggle between her human curiosity and the darker instincts that plague her intensifies. This journey not only tests their emotional bonds but also raises unsettling questions about the nature of humanity and what it truly means to be human. In a world where everything seems lost, it is sacrifice and hope that could make the difference in the future of the human race.