In a quiet American town, a doctor named Miles Bennell returns from a trip to find a disturbing atmosphere. His patients begin reporting that their loved ones have changed, as if they have lost part of their humanity. Intrigued and concerned, Miles investigates and discovers that strange cocoons are appearing in the area, from which perfect replicas of the missing people emerge. These copies are emotionless beings, incapable of love or feeling.
As paranoia takes hold of the community, Miles teams up with his ex-girlfriend, Becky, to unravel the mystery. Together, they try to alert their friends and family, but they are met with growing distrust and fear. As they uncover the truth behind this invasion, the pressure mounts when they realize that the phenomenon is not only local but could quickly spread to other parts of the country.
With time against them, Miles and Becky must fight not only for their own survival but also to preserve what remains of their humanity. The atmosphere of terror intensifies as they come to realize that time is running out and that the only way to stop the threat is to take desperate measures. This gripping tale explores themes of identity and the loss of humanity, leaving the audience questioning what it truly means to be human in a world where appearances are everything.