A group of diverse individuals are suddenly taken from their homes and flown via helicopter to a futuristic bomb shelter in the desert, one-third of a mile below the surface of the Earth. There, they learn that a nuclear holocaust is taking place and that they've been "chosen" by computer to survive in the shelter in order to continue the human race. The shelter is designed to allow the people to exist underground comfortably for years, but they are faced with a threat nobody could have predicted: a colony of thousands of bloodthirsty vampire bats finds a way into the shelter and launches a series of vicious attacks where they claim the humans one by one.
Reporter Curt Devlin loves sob sister Ellen Garfield but believes women are "bum newspapermen". When she learns the identity of a murdered arsonist, he calls it luck. When she goes after the murderer he gets enough evidence to have Maitland Coulter arrested. She finds a bunch of "not guilty" ballots and publishes the wrong story; he eavesdrops on the jury and gets the correct verdict. After being fired she gets a confession from the real killer and gets Coulter released.