No running. No diving. No lifeguard on duty. No swimming after dark. Based on the acclaimed 2014 short film, “Night Swim” tells the story of Ray Waller, a former major league baseball player forced into early retirement by a degenerative illness. Secretly hoping, against the odds, to return to pro ball, Ray persuades his wife, Eve, that their new home’s shimmering backyard swimming pool will be fun for the kids and provide physical therapy for him. But a dark secret in the home’s past will unleash a malevolent force that will drag the family under, into the depths of inescapable terror.