"3rd Night" is a movie that should have been better. It appears to have the material to be good. It's convincingly acted, and has a final scene that is effective and makes you wonder why the whole movie - or at least any other moment - couldn't have been that good.
For something like this, you need a filmmaker who holds you in the palm of their hand, like Ari Aster would. Instead, it fails so utterly at the level of pacing that any effectiveness is lost, and you wonder what the point is.
The movie, near as I can tell, is about a couple who move into a farmhouse and find themselves monitored by a mysterious and malevolent presence.
What's weird is... they don't seem that bothered by it. Obviously, in horror, people never act until it's too late: if they did, there'd be no movie. But here it's like they forget all about the threat of danger, so of course, so do we.
You wait for the movie to start engaging you, and when it doesn't, you wait for it to end.