Like with M. Night Shyamalan’s last film Old, the premise here is the kind of high-concept story that wouldn’t look out of place in an SF anthology series like The Twilight Zone. While vacationing in a remote cabin in the woods, couple Eric (Jonathan Groff) and Andrew (Ben Aldridge) along with their adopted daughter Wen (Kristen Cui) receive the titular Knock from four strangers (Dave Bautista, Nikki Amuka-Bird, Abby Quinn, and Rupert Grint). Under the impression that the world is about to end, they tell the couple that there is only one chance to avert the apocalypse: One of the family has to die, and it has to be by a loved one’s hand.
