The film tells the story of how, in post-war Spain, Narcisa (played by Aria Bedmar), a novice with supernatural powers, arrives at a former convent, now a school for girls, to become a teacher. As the days go by, the strange events and increasingly disturbing situations that torment her will eventually lead her to uncover the terrible web of secrets that surround the convent and haunt its inhabitants.
Tim, an amateur filmmaker, returns home to film his brother Sean's funeral after his apparent suicide. But in the days that follow, Tim discovers Sean's obsession with an Internet urban legend that does not exist about a secret government mind control experiment gone horrifically wrong, Project MKHEXE.