For the past year, photographer Shawn Burnett and his wife Helen have been grieving the loss of their first child, which died in Helen's womb before it could be carried to term. They're hoping that a move to the country will help them both heal and move on with their lives. Shawn is somewhat irritated that the move involves him taking charity from Helen's brother Frank, but he's willing to do whatever he can if it will give Helen solace. Frank promises that he will build the two of them a brand new house, but until the construction is done they must stay in an older house with a decrepit cabin in the backyard. Shortly after they move in, Helen becomes pregnant again. Shawn is fascinated when he discovers via some neighbors that the cabin is reported to be haunted by the ghost of a witch that curses anyone trying to get pregnant, seeking revenge against a husband that murdered her own child years ago. While investigating the legend Shawn injures himself on a tooth left in the cabin and develops a severe infection. As the infection worsens Shawn begins to experience strange visions and events, unsure if they are real or delusions triggered by the infection and a possible latent mental illness, as his own father murdered his wife and then killed himself. This worries Shawn as either way this poses a potential threat to Helen, either by the witch's hand or by Shawn's possible mental illness, and he decides that he will get Helen out of that place. This puts him at odds with Frank, who believes the land to be completely safe. As things grow more strange and Shawn becomes more unstable, things culminate in a chase scene that ends with Shawn firing a gun at his wife. Authorities are called to the scene and Shawn tries to explain the story of the witch, only to be told that there is no witch and that the neighbors never existed. He's then taken to a mental institution, leaving Helen to live in the house by herself. The film ends with Helen listening to a phone message from Shawn and then turning to the camera with a malevolent look, leaving it up to the viewer to decide if the events in the film are the result of Shawn's psychosis or if there actually is a witch and that she has possessed Helen at some point during the movie.
Critical reception for Conjurer has been positive. Dread Central gave the film three out of five blades and praised the movie's acting and directing. LA Weekly also praised the movie, which they stated had "a thick mood of gothic dread".
