Adam and Margo's housewarming party is a success. However, one mysterious couple linger long after all the other guests have left. The couple reveals themselves to be Tom and Sasha, wealthy neighbors, but as a single nightcap leads to another, they start to suspect these new friends are actually duplicitous strangers.
This movie contains 24 potentially triggering events.
After a dog is hit by a car, a woman decides to put it out of its misery. It becomes pretty clear what is going to happen so you can skip forward a bit.
Yes, they do show the woman doing a line of cocaine on screen and putting the remainder in her gums. I believe the user above has only seen half of the film.
Alcohol is consumed frequently throughout the film, it's responsible compared to the other substances used (cocaine, cigarettes). It takes place at a party and only features adults, I wouldn't consider that abuse.
Near the beginning when you see a couple driving home, the suddenly his something in their car.
A little bit later, when the woman protagonist is looking in the fridge, a man appears suddenly.
It is suggested that violent characters have PTSD by an outsider who doesn't know them personally, they have no official diagnosis and a mental illness is never mentioned otherwise.
Towards the end of the movie, the villains of the movie blame their actions on childhood trauma. Also, the very last scene shows someone reacting to trauma triggers.
Multiple times, once near the beginning and a couple times near the end. One of the plot threads shows a couple, and then just the woman, driving around, so be aware when those scenes are happening.