A US sub picks up Navy SEALs and receives an order for a nuke launch. Due to the circumstances of the order, the Captain refuses to fire. After escaping an attack from another US sub, the crew and SEALs take refuge on a small island.
A small town in Kansas is literally left in the dark after seeing a mushroom cloud over near-by Denver, Colorado. The townspeople struggle to find answers about the blast and solutions on how to survive.
Fresh out of the farm, Annie Walker must adapt to the challenging life of a CIA operative under the guidance of her handler, Auggie. But soon she realizes her recruit might have to do with her last boyfriend rather than her talent.
Dean Gallagher and Chase are brothers. Competitive alpha males, they argue over everything, agree on nothing, but defend each other from outsiders no matter what. They're also members of the elite RESCUE Special Operations Unit.