Two sisters swimming at a public indoor pool get trapped beneath the pool cover. Things get really bad for them fast as the place closes up for holidays.
I thought it seemed hokey to be stuck under a cover but a thick fiberglass sheet is a different story. One of the ladies is diabetic which ups the ante. Things get even worse when possible help turns around and extorts them. Similar to Extortion (2017).
An emotional roller-coaster for sure as we find out they were abused and they lost their father in a fire. So all these different elements are wearing them down slowly. It is one of those films you find yourself yelling at the screen for them to either do this or don't do that. Which you can either love or hate.
If you tune in for Tobin Bell his role is limited to telling people to get out and then he closes the pool cover. More of a fan winking cameo than anything.
Overall the flick is pretty good and you might even shed a tear or two.