A young woman named Michelle leaves her apartment in New Orleans after having an argument with her fiancé, Ben. That night, while driving through rural Louisiana, she hears news reports of blackouts in several major cities. Suddenly, Michelle's car is struck off the road, knocking her unconscious. Awakening with an injured leg, Michelle finds she's chained in a bunker. Her captor, an older man named Howard, unchains her and explains he captured her to save her life; there has been an attack that left ...
A young woman named Michelle leaves her apartment in New Orleans after having an argument with her fiancé, Ben. That night, while driving through rural Louisiana, she hears news reports of blackouts in several major cities. Suddenly, Michelle's car is struck off the road, knocking her unconscious. Awakening with an injured leg, Michelle finds she's chained in a bunker. Her captor, an older man named Howard, unchains her and explains he captured her to save her life; there has been an attack that left the air outside poisoned.
Howard gives Michelle a tour of his bunker, which also houses his construction assistant, a younger man named Emmett. Through a viewport, Howard shows her two decayed pigs as evidence of the fallout. However, Michelle sees Howard's truck and recalls it striking her car. She privately relays this to Emmett, who dismisses it, saying he came to the bunker voluntarily after witnessing the attack. During dinner, Howard shows flashes of jealousy, and little tolerance for Emmett. Michelle attempts to escape, injuring Howard, but witnesses a woman covered with lesions outside, who ends up bashing her head on the door. Horrified, Michelle retreats, and Howard claims that he accidentally struck Michelle's car in a panic trying to reach the bunker. Convinced into trusting him, Michelle stitches a cut she caused Howard.
Over the next few days, the trio begins to adapt to life underground, and Howard opens up about his late daughter. Soon the air ventilation system fails after something loud passes overhead. Howard sends Michelle through a small duct to reactivate it. In the control room, she finds a padlocked skylight with "HELP" scratched on the inside, and an earring she saw in a picture of Howard's daughter. Michelle shares this with Emmett, who recognizes the girl in the picture as a local girl who disappeared two years earlier; it's further revealed that Howard's actual daughter left with his wife. Deciding to seek help, Michelle begins to fashion a makeshift hazmat suit to venture outside.
Howard soon finds the tools Michelle and Emmett were using, and threatens to immerse them both in perchloric acid. When Emmett claims responsibility, Howard shoots and kills him, telling a shocked Michelle that now they can be a family of two. Michelle secretly finishes the suit while Howard cleans up. When Howard discovers this, Michelle flees and is able to upend the barrel of acid onto him, disfiguring him and starting a fire. Leaving Howard to his fate, Michelle dons the suit and escapes. Michelle sees birds outside, realizing there's no fallout. She removes her mask and notices a biomechanical alien craft in the distance, which notices her when the bunker explodes from the fire.
The craft attacks Michelle, discharging a green gas, which she overcomes with her mask. Michelle is attacked by a quadrupedal creature and takes shelter in Howard's truck. The craft's tentacles lift the truck to reach Michelle, but she destroys it with a Molotov cocktail. Escaping in the woman's car, Michelle hears a broadcast about the battle with the invaders; survivors are instructed to seek safety in Baton Rouge, while help is requested from anyone with medical or combat training in Houston. Michelle heads for Houston while a larger alien craft is revealed, silhouetted by lightning.
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