In a near future, normal life on Earth has been decimated. Paul (Nicolas Cage) and his two sons, Thomas (Maxwell Jenkins) and Joseph (Jaeden Martell), have been living a half-life – tranquility by day and torment by night. Every night, after the sun sets, they face the unrelenting attacks of a mysterious and violent evil.

One day, when Thomas doesn't return home before sundown, Paul must leave the safety of their fortified farm to find him. A nightmarish battle ensues that forces the family to execute a desperate plan to survive.