Located in Brown Hill, North Carolina, USA, there have been reports of UFO sightings and human abductions since the mid-20th century. Aliens or government military secrets? Confusing, different opinions. Until one day, Riley Morris (Riley Polanski), a teenager with autism, inadvertently records everything terrible with his camera. On an ordinary holiday, Riley drives to camp in Brown Hill with his father Peter (Peter Holden), mother Katherine Sigismund, brother Corey Eid and sister Jillian Clare.　　On the first night, they witnessed mysterious points of light flying in the night sky, and the next day they got lost on the way, and saw empty vehicles and terrifying creatures in the tunnels. In the chaos, Pete is kidnapped by the other side, and the other members of the Morris family flee with an uncertain future......