This story is not fun to watch, but it is very realistic.
What makes this story "honest" is that it is messy, like what might really happen.
When you kill people, it isn't like in the movies where you can simply clean up, dispose of the body and move on. There are other factors involved even if you manage to dispose of the body without drawing attention to yourself as the person of interest.
The main character in this story managed to screw up what could have been a "clean" disposal. Her dad is a sheriff, so she knows things average people don't. And yet, she still manages to ruin her getting away with it...because her son is involved. He actually dealt the fatal blow.
Beyond that, the story spirals into territory you don't quite expect, but which makes sense once it unfolds.
And the ending was a bit more true to life as well, though rather depressing. But that's the reality in some situations and surroundings.
The language wasn't too bad, either. But it was realistic. Not every other word was foul, so the dialogue writers understand real people just don't use foul language as liberally as Hollywood seems to want you to believe.
Overall, a great film. No, it is NOT a thriller. It is a drama that involves a murder. Much different.