The new supernatural horror film Don’t Knock Twice benefits greatly from the direction of Caradog James. He takes a story that almost immediately plunges viewers into an unexplained and messy mythology and, for the better part of an hour, manages to distract from its weaker aspects by implying something far more interesting. Unfortunately, then the third act happens, and the spell is broken.

The film's storylines fail to inform or intensify each other in any theme-deepening or character-developing ways.

The best reason to see Don’t Knock Twice is the volatile chemistry between genre favorites Katee Sackhoff and Lucy Boynton.

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

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