It starts with a sneeze. It kills in four days. There is no cure.
While a pair of charismatic CDC researchers and their team search frantically for the cause of and cure for a wildly contagious virus that kills within four days, a married couple and their children, seeking safety, flee to an isolated mountain cabin, not knowing that they are heading into the heart of the infection’s source. Meanwhile, panic spreads around the globe as the US falls rapidly into chaos and other countries seem to be not far behind.