9/10 Terrifying and compelling.
There is a surprising lack of music and sound effects, which is amazing, because those are generally used to telegraph the viewers' emotions. The emotions you experience in this film is exclusively through the characters and the merit of the directing.
The cost to film this must have been pennies. Compare this on the heels of Cats, which had almost nothing going for it and cost a sickening $100,000,000.
There is an incredibly unique writing device used about 2/3 into the film, which threw me for a loop and was very effective.
Instead of catching there killer and turning him in, the film ends with deep consideration for the impact it would have on the family, something I wouldn't have considered.