It's hard to feel invested in a movie where the characters behave in ways that logical humans would not. The husband constantly downplays the wife's concerns, when if anything, they should both be MORE concerned. An unstable woman is squatting below their house and that woman is breaking and entering and claiming the house is hers. That's not a nuisance. That's a BIG PROBLEM and to treat it otherwise is just unrealistic. It's always better in storytelling when the characters do everything a logical person would do and yet STILL find themselves in trouble.

Also, how long has this woman been homeless? There's a point where a person's Botox and face and lip fillers would have worn off. Or am I supposed to believe a homeless woman is buying plastic surgery and aesthetic procedures?

On a positive, it's kind of a throwback to domestic thrillers like The Hand That Rocks the Cradle or Pacific Heights. That far-fetched weirdly uncomfortable scenario.