Caught in the vortex of a nuclear attack, John and Samantha Worthington manage to take cover and survive the blast but emerge to find that their town has been virtually obliterated. In their search for survivors in nearby cities they soon discover that these attacks have taken place on a grand scale. John's health begins to deteriorate as a result of exposure to radiation, but when they finally discover a secluded group of mysterious survivors he is offered a revolutionary form of treatment to be administered by their physicians. The effect of this procedure will put their relationship to the ultimate test. As they both confront their own nightmares, they also discover that their new, pristine community is hiding a dark and terrible secret. A secret that will change the course of humanity.