Three stars doesn't accurately represent this movie. It's more of a four-star / two-star review. The four stars go to the excellent leads, the intriguing set-up / mystery elements and the unsettling, surreal horror that the film effectively invokes. The two star elements are mainly down to the plot development, insofar as there isn't really much of it, certainly not enough to be satisfying. I loved some of the imagery, felt stifled by the claustrophobic atmosphere just as I was supposed to, but just felt very 'meh' about the payoff. Without getting into spoilers, it's not difficult to figure out the nihilistic message of this film, but it doesn't really offer any insight into these themes it explores. It simply presents them as something horrific and that's that. I wanted more.