Emilia is sent to a convent where paranormal forces start to manifest among the holy and the tortured.

It's 1931. Emilia, a rebellious and defiant young woman, is sent by her father to a convent. Her arrival unleashes paranormal manifestations in the place, which become increasingly strong for all the residents, religious and mentally ill women confined, but even more for Emilia, like a cry for help which is impossible to ignore.—Del Toro Films