Whilst this is a confidently made film it's all a little disappointing mainly because the set up never delivers a satisfying conclusion and it's build up of shadows, mists and the threat of something lurking seems to drag despite the short runtime. This is set 45000 years ago and a nomadic band have crossed the sea to a new land which is wild and barren. Getting increasingly hungry they find themselves stalked by some unseen menace and are forced into a dark forest. All the tropes of a horror film, ie a monster story, are then in play but the finale as various gory deaths occur is much more obvious and there's a hint of the thematic inclination of humans learning early to destroy each other due to difference and suspicions. Partially interesting it's ultimately a bit of a letdown.