I don’t intend on seeing it, but from the reviews there is a “twist ending”- which I think I can guess from the reviews. So, spoil me. Please. 
from www.moviepooper.com:
[spoiler]Julianne Moore says she was carjacked by a black man, leaving her 4 year old in the backseat.
It turns out she made up the story after sleeping with her neighbor, neglecting her son and later finding that he drank a bottle of cough syrup killing himself.
She buried the kid in a park[/spoiler]
Yep, about what I expected. :rolleyes:
Shades of Susan Smith, no?
Haaaate. Hated, Hating, Hate-i-fied. Haaaaated that movie.