Although replete with creepy shocks, this lacks the narrative finesse to match the committed performances and slick visuals.

The actual horror and thriller aspects just don't gel together with any of the other elements, making James' latest genre effort a movie I respect multiple elements of even if I can't say I enjoyed near as much as I can't help but wish I did.

If it had skipped the clichd supernatural elements to instead concentrate on the relationship between the two central characters, Don't Knock Twice might have emerged as an interesting film.

Doesn't know whether it would rather be a B-movie full of fantastic scares or a dramatic thriller whose frightening scenes mirrored the tension the characters were experiencing.