... because by the time the credits roll and you start to breathe normally again, you will suddenly realize that this was not a horror film as such, this was a re-enactment of events that actually happened, with real victims and real perpetrators and real well-meaning third parties covering up the whole thing as fast as the body count kept piling up.
And then you will once again have difficulty catching your breath.
As a film it is superb. McCarthy who did double duty as writer and director deserves acknowledgement. The cast is universally excellent. Ruffalo gives the performance of his career, Keaton is solid as a rock, and McAdams reaps overdue dividends from her decision to broaden her career into non-glamorous roles at a time when the only scripts they were sending her were for Diva parts. Smart lady.
A reviewer is not supposed to interject personal feelings in a review but I will say without apology that I miss films like these -- films that speak for the injustice in society and offer solutions -- and wish there were more of them. It seems that when I was younger there was a lot more interest in doing the right thing merely because it was the right thing. This no longer seems to be the societal meme, and that troubles me.