Becky (Laysla De Oliveira) and her brother Carl (Avery Whitted) drove on the road. Halfway through, Becky, who was already pregnant, felt very uncomfortable, so she got off the car to rest. At this time, she heard a child's cry for help in the tall grass on the side of the road. Following the sound, Becky and Carl walked into the tall grass one after another, but they didn't know that they had stepped into the gate of hell. The tall grass is like a living demon, devouring all the lives that strayed into it. In the tall grass, Becky met Ross (Patrick Wilson), who was also lost here. Although this man is handsome, he exudes a dangerous breath. Jarvis (Harrison Gilbertson) is Becky's boyfriend. After his girlfriend disappeared, he embarked on a journey to find someone.