“不准奔跑、不准跳水，天黑以后没有救生员值勤，不准游泳。”
影片根据2014年拍摄的同名短片改编，内心深处希望能够战胜病魔，再度回归美国职棒大联盟打球的雷（怀亚特·拉塞尔 Wyatt Russell 饰）和他的太太伊芙（凯瑞·康顿 Kerry Condon 饰）搬进新家，后院的游泳池不仅让孩子们玩得开心，也能够让他进行物理治疗，然而这栋房子阴暗神秘的过去即将释放一股邪恶力量，把这一家人拉进无法逃脱的恐怖深渊。

1979, New Mexico, USA. Olmo is stuck. Today is his turn to take care of his sick father even though he is only 14-years-old and would much rather be hanging out with his best friend, Miguel. But when Olmo gets invited to a party by his beautiful neighbour Nina, he will do whatever he can to get out of his duties, embarking on a journey of mischief and chaos. As the night unfolds, he may come to love the very place from which he has spent so long trying to escape: his home.