Was filmed in November 2016 but not released until the end of 2018. The long post production period was due to a change in management, and the new head of studio wanted some changes in the end result. Fortunately, director Diederik Van Rooijen had shot enough material to accommodate these changes.
Director Diederik Van Rooijen caught the attention of Hollywood with his low-budget thriller Taped (2012). He moved from the Netherlands to the USA with his family in 2014 to direct a remake of Alfred Hitchcock's The Birds (1963). However, the studio couldn't decide between a classical remake or a modern take on the material, so the project got stuck in development hell. In the meanwhile, van Rooijen got involved with The Possession of Hannah Grace, and decided to make it his American debut.
Shay Mitchell is the fourth lead actress of "Pretty Little Liars" to have played a leading role in a horror movie, after Ashley Benson in "Ratter," Troian Bellisario in "Martyrs" and Lucy Hale in "Truth or Dare."