Charlotte's daughter Stella is sensitive and brilliant, perhaps even a genius, but a recent change in her behaviour has alarmed her parents. Following the sudden death of Stella's babysitter, Blanka, the once disruptive and anti-social child has become docile and agreeable. But what's unsettling is that she has begun to mirror Blanka's personality, from Blanka's repetitive phrases to her accent, to fierce cravings for Armenian meat stew after being raised a vegetarian. Charlotte is pregnant with her second child, and depleted and sick with the pregnancy. She is convinced that Blanka herself is somehow responsible for Stella's transformation. As Charlotte becomes increasingly obsessed, she is sure that only she can save her daughter...