The problem isn’t that “Night Swim” — written and directed by Bryce McGuire, who based it on his 2014 short film of the same name and shares the story credit with Rod Blackhurst — eschews the mildly campy tone that worked well for “M3GAN.” After all, a haunted backyard swimming pool is, as you come to observe, deadly serious business. But then it IS a problem that “Night Swim” scores so many, seemingly unintended, chuckles during its climactic stretch when things go off the deep end.
Until then, we get acceptable if by-the-numbers stuff, McGuire introducing us to the Waller family, led by former Milwaukee Brewers third baseman Ray (Wyatt Russell, “The Good Lord Bird”) and teacher Eve (Kerry Condon, “The Banshees of Inisherin”), the parents of teen Izzy (Amélie Hoeferle, “The Hunger Games: The Ballad of Songbirds and Snakes”) and her younger brother, Elliot (Gavin Warren, “Fear the Walking Dead”). They’re on the hunt for a new home and settle on a fixer-upper with a seemingly long-unused pool that appeals to Ray, whose career ended due to his battle with multiple sclerosis,
In fact, when we meet Ray, he’s battling headaches and blurred vision, his new doctor suggesting the MS has progressed significantly. In Eve’s mind, if there is any good that could come from this is Ray accepting that his baseball career truly is over. After years of trades and the resulting relocations, she’s ready to put down roots.
“I want that, too,” he says. “I promise.”
And yet, after the pool’s been rehabilitated, he seems to be benefiting miraculously from its spring water: A wound on his hand heals quickly, and he feels better than he has in a long time, with subsequent medical tests looking very promising.