The trailer makes it look like a 90 minute, teen horror flick where they are trying to summon The Empty Man, like the Bye-Bye Man, or Slenderman or Candyman. That is NOT what this film is about. It is far more complex than that - "The Empty Man" is a small part of a bigger picture.
Do not expect to have your hand held and have everything explained to you.
Do not expect to be scared out of your seat 30 times.
Do not expect to fully understand what's going on throughout the film or even after it's over.
Expect to be disturbed, as much of the film is unsettling - though you can't easily explain why
Expect to be bothered that you don't know exactly what's going on but just go along for the ride
Expect to watch the film again to better understand it and to catch things you missed the first time
Although I rented it on Prime and had another 30 days to watch it again, I immediately bought it as well. I have watched it multiple times and am blown away by the pieces I have put together and am thankful that director David Prior didn't over-explain everything.
I have been reading a lot of the negative reviews of the film and have seen complaints such as "too long," "too slow," "it's all over the place," and "It doesn't' make any sense." The movie IS long, 2 hours and 17 minutes. It is somewhat slow and yes, the director takes us to different scenes multiple times throughout the film. It is also very difficult to fully understand - because the content involves things that we are not supposed to understand. The film was marketed as another "man" horror movie as mentioned above and as such, reached the wrong audience. This film will eventually be viewed as a masterpiece of cosmic horror and we will have David Prior to thank for that.