David Robert Mitchell's It Follows is like nothing we've seen before, and yet it owes so much to what came before it. A cross-breeding of tropes from the past 40 years of horror cinema, the movie is gorgeously shot, vividly told, and full of teen characters that have an unusual amount of compassion for each other. At its center is Jay (played by The Guest's Maika Monroe) who contracts an STD that makes her see visions of ghosts following her. The only way to avert death is to pass on the bug.