It's engrossing. It's funny. It's dark.

Inventive, needling use of sound and the blurring of reality and fantasy take us under the skin of a woman at breaking point. It’s an impressive, immersive piece of film-making -- and a profoundly uncomfortable watch.

Byrne refuses to sand down Linda’s harsher edges, yet she reveals the raw terror beneath the fury. The result is a bruising character study that challenges the audience to sift genuine catastrophe from psychic projection.

Come for Rose Byrne and Conan O’Brien, stay to see how long you can stare into the widening hole without flinching.