This is by-the-numbers, low budget genre filmmaking, nodding in the direction of both The Silence Of The Lambs and The Exorcist as it trundles to its pre-ordained conclusion.
Lotz plays Annie, the tough, motorbike-riding single woman trying to cope with her mother's death and quickly discovering ghostly presences in the mother's home.
Dialogue is sparse. Reflections, flickering lights, and strange images on blackberries and computer screens are used to increase the sense of foreboding before the serial killer turns up in the final reel.
The plotting is contrived in the extreme but at least McCarthy tackles his material with a certain grim conviction.