"No running, no diving, and no swimming after dark unless there is a lifeguard on duty." The film is based on a short film of the same name shot in 2014. Deep in his heart, Ray (Wyatt Russell), who hopes to defeat the disease and return to play in Major League Baseball, and his wife Eve (Kerry Condon) move into a new home. The swimming pool in the backyard not only allows the children to have fun, but also allows him to undergo physical therapy. However, the dark and mysterious past of this house is about to release an evil force, dragging the family into an inescapable abyss of terror.