Un homme tente de survivre au jour le jour avec ses deux fils adolescents. Cependant, la famille n'est pas en sécurité. Chaque nuit, après le coucher du soleil, des "créatures féroces" commencent à chasser, tuant tout être vivant qui croise son chemin... In a near future, normal life on Earth has been decimated. Paul and his two sons, Thomas and Joseph, 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.