Currently you are able to watch "Sinister" streaming on Pluto TV for free with ads or buy it as download on Apple TV, Rakuten TV, SF Anytime, Viaplay. It is also possible to rent "Sinister" on Apple TV, Rakuten TV, Viaplay, SF Anytime online
True-crime writer Ellison Oswald is in a slump; he hasn't had a best seller in more than 10 years and is becoming increasingly desperate for a hit. So, when he discovers the existence of a snuff film showing the deaths of a family, he vows to solve the mystery. He moves his own family into the victims' home and gets to work. However, when old film footage and other clues hint at the presence of a supernatural force, Ellison learns that living in the house may be fatal.