After virtually drowning in a lake, Madison finds herself certain to a lifetime of concern. Unable to explain what occurred to her throughout the moments she was underwater, she begins to develop hydrophobia: an irregular concern of water. Crippled by her put up trauma, Madison makes an attempt to close out the world however her concern intensifies and she or he is confronted with the imaginative and prescient of a darkish determine that haunts her day and night time. After watching her battle for one yr with the phobia and visions, Madison’s 4 mates try an unconventional intervention wherein they by accident open a floodgate to a darkish place the place none of them are protected. As Madison and her mates dive deeper into the darkish historical past of this determine that haunts them, it reaches out and begins dragging them to a horrifying place that they will by no means come again from.