Nefarious
First, this movie was not anything like what I expected. I hadn't really watched the trailers and didn't know about the background or source material going in. Agree and disagree with GH in that it is something we've seen before but at the same time, it isn't at all.
Yes, we've seen possession movies and idea that evil survives the original host by finding new vessels. As far back as The Exorcist we've seen that same theme. But we haven't seen it explained or displayed in the thoughtful, analytical way this movie expresses it.
There were no scenes of the possessed writhing on a bed, spewing invectives in ancient tongues, or vomiting up wads of hair, blood, flies or bees. There was no demonic growling voice or rotting of the flesh of the possessed. Any demonic transference that occurred happened without smoke, fire, eyes changing color, screaming or any of the tropes we've always associated with that event. All of it was carried out with a calm and rational, slowly simmering menace.
He'll never get the credit he deserves but Connor McManus from Boondock Saints (Sean Patrick Flanery) is extremely good in the role of the possibly possessed/certainly condemned man. It could just be that his performance was so much better than the stilted stiffs around him, but he was superb.
Why will he never get credit for it? Because this film is at its core a rejection of the current world view. It's a condemnation of the slippery slope that has allowed humanity to grow more and more distant from God as we slowly accept and celebrate the mockery of our Creator. This is a film of the type Hollywood won't back, won't promote and won't acknowledge. Ridicule Christians? Sure. Mock Christianity as outdated and its adherents as rubes? Absolutely. Show Christians in the most unflattering light possible? Definitely. Give any credence to Christian themes? No way. That's why no matter how good Flanery's performance is (and it's extremely good) he's more likely to find himself blackballed by the industry for taking part in a film like this than he is to be celebrated or honored for it.
If you are a Christian; if you truly believe there is a war raging between the forces of Good and Evil (capital letters on purpose); if, in your heart, you know that the things we see, do, tolerate, accept, celebrate, and ignore are driven by the forces of chaos and destruction, then this film will resonate in ways you probably didn't anticipate.
I am one of those. I believe in God and I believe in Christ. I am appalled at what I see in the world today. It sickens me. I believe that all it takes for evil to win is for good men to do nothing - and we have done nothing of late. The things I see emanating from our political system, from our media outlets, from entertainment disgust me. I do believe that a large segment of our political/media/corporate structure pursues an agenda that is driven by evil. Many of the "leaders" who have wormed their way into power (legitimately or not) may not sit around drinking the blood of sacrificed children, but they ARE in cohort and are certainly evil at heart, even as they pretend not to be.
This isn't a great film. The sets are sparse, there's no CGI, the acting is wooden at best (other than Flanery, who is outstanding), and the production is lacking. There is, however, the core message that all of us need to hear and heed.
Maybe demonic possession isn't actually a thing. Maybe it is. Using that as the basis, though, this film touches on the broader struggle of our own selfish, base desires, mankind's own need to elevate our thoughts and beliefs above those of our Creator, and the notion that we are losing the battle against the forces of evil when we are distracted by and focus on idiotic things like those the psychiatrist ticks off as symbols of man's "progress."
I've really only been scared by three movies in my entire life. The Omen, The Exorcist and now this. The terror invoked by both Omen and Exorcist was different than this. Nefarious provided no jump scares, no shock/horror, no gore, no 'final girl', no brutality. Instead, it slowly unspooled a much deeper examination of where humanity currently resides in relation to God. That is frankly terrifying to consider. The film has, at least, given me pause and caused me to re-examine some of my own positions.
I already know there are some on this board who will pish-posh the entire film as demented, right-wing, psychobabble. I can hear Flanery's evil, knowing laugh even as you do.