After a while, this well acted, directed and photographed low key thriller becomes so frustratingly illogical that I had to restrain myself from yelling at the screen: "Call the police already!" To say, "It's only a movie" doesn't help here. The plot strands involving Frances' (Moretz) roommate, her father, the detective he hires as well the police and Frances' co workers at the restaurant never mesh the way they should leaving the characters on the screen stranded in individual and collective stupidity. The film becomes limited in it's scope and finally rather dull and uninteresting. Like Bird Box, A Quiet Place and Velvet Buzzsaw, you'll probably stick around to see how it all ends while enumerating all of the things that are simply unbelievable or never explained making you feel superior to what unreels. Not the best way to view a movie. Isabel Huppert would be memorable if only the screenplay were better and had characters who were less negligible and ineffectual especially Steve Rhea's detective and Frances herself. On a viewing scale, Greta is less odious and tedious than "It" or "Hereditary", but it is not by any means a must see.
