Set just before the start of the Armageddon the series follows two central characters a physicist and a nun in a race against time to see if the end of the world can be averted. Bill Pullman plays the role of Dr. Richard Massey a Harvard physics professor and father mourning the death of his daughter who was murdered by an evil satanist with seemingly supernatural abilities. Natascha McElhone stars as a nun who appeals to Massey to help her investigate whether the apocalyptic prophecy from the Book of Revelations is starting to come true.