Amy Adams really does throw herself into this as mother to a young lad whom she looks after whilst her husband (Scoot McNairy) goes to work - frequently for many nights at a time. There's no suggestion of infidelity, but gradually she begins to feel the strains of this relentless young lad's activities. He rarely wants to sleep, is always full of beans and has a penchant for repeating the odd expletive at exactly the wrong time! It's when she starts to notice some unwanted bodily hair, then some seemingly enlarged incisors that she begins to worry if she isn't undergoing some sort of transformation. All of a sudden, dogs start to show a special interest in her and she and their youngster start to play doggy a great deal more... She also finds herself experiencing flash-backs of her own mother and of her erratic behaviour. Might it be something in the genes? It's Adams's performance that stands out here, otherwise it's a really disappointing attempt at an horror story that falls between a multitude of stools. The character - few actually have names - vacillates between adoring mother (and, occasionally, wife) and maniac entertainingly enough for a while but then it becomes repetitive to no end. Sure, she's exhausted with her childcare responsibilities but why is that different to any other parent (not necessarily a mother) when faced with a child keen to explore and prone to tantrums. The marital relationship is presented in an wholly skewed fashion as if poor old Scoot - who was missing large chunks of their son's development - was somehow in clover whist she sacrificed her life and career as the "home-maker". In the end, once the humour had subsided, I found this a rather dull rant of a movie that contrived to suggest that this was a woman unique amongst parents, and that motherhood was somehow more visceral than fatherhood. What horror elements there are are entirely undeveloped and by the end I was just a bit bored. I did like the exhibits in her gallery, though - ideal for the Christmas tree, and the young lad (I think there were twins) was the real star of the proceedings.