Demian Bichir and Taissa Farmiga are already set to star in the thriller, which sees Bichir playing a priest named Father Burke who is dispatched by Rome to investigate the mysterious death of a nun.

Aarons played the sinister sister in The Conjuring 2, with the character breaking out and getting her own movie. How she figures into the new movie is being kept under the habit.

Corin Hardy is directing the project, which was written by Gary Dauberman and Wan. Wan and Peter Safran are producing.

Production is set to begin in May in Romania. New Line has stenciled a release on July 13 (a Friday!), 2018.

The Nun is the second title to spin off from the Conjuring universe, with Annabelle being the first. A sequel to the latter, Annabelle: Creation, is set to open Aug. 11. That movie could propel the franchise — which has grossed over $897 million so far with just three low-to-moderately budgeted films — past a billion dollars.

Aarons’ credits include appearances in David Lynch’s Mulholland Drive, the Princess Diaries movies and Sam Raimi’s Drag Me to Hell. She is repped by Mills Kaplan Entertainment.