An atomic bomb has exploded at the annual G20 conference in Hamburg, Germany setting off a cascade effect across the globe. The United States was already experiencing food and fuel shortages, electricity interruptions. EMS services no longer rolled when fires engulfed buildings and gunshots rang out in the streets. Eight brave groups try to survive the first day. Group Steven and Joy are separated by 200 miles. Joy and their three kids are traveling in southeast Oklahoma. They all are in a desperate race to find shelter and each other. Group Chonna, the teenage daughter of a software designer living in Silicon Valley and Rusty her body guard run for the foothills using advanced technology. Group Jamal recently left the military, Janet his wife trying to go to school. Their two young kids, all living in the inner city. The combat zone. Martial law trying to keep them in the zone. They make a desperate run for the Detroit River with help from Walter an old retired military veteran. Group Corderus, half Navajo, visiting his grandparents on the reservation for the first time. The Dine believe in harmony with nature. They head to the old Pueblo village called Keet Seel and Betatakin, a return to the old ways of life. Group Ann, 15 years old who lives with her dad, Brian, in a high rise. Inner city revitalization gone wrong when the tower catches on fire trapping Ann and her dad on the 25th floor. No place to go but up. A story about a desperate struggle to survive a collapsing building. Group Four friends on a cattle ranch, four families, the "Four Square Ranch" comes under attack from cattle rustlers and a drug cartel. Everybody in the family must fight to save the ranch and preserve their way of life. Group Johnny and Rachel, a true love story. Separated by ten years for bad behavior. They find themselves on a mercy flight with five orphaned newborns. They hop from town to town in a small plane trying to find a place to stay before the world collapses around them. Group Two groups struggle to survive day one, both military groups from Nellis Air Force Base. The first group is a school for troubled kids, 15 of them. Their teachers are 8 special forces soldiers led by Todd. The second group is 50 military brats whose parent's are both in the military. 12 soldiers are escorting them to meet up with the troubled kids. A DC-3 with 25 North Korean soldiers parachutes among both groups.