Very good account of a psychotic break, well thought out and touching. Anya Taylor-Joy is so smart it's scary and the actress playing the young girl gradually breaking down is excellent, helped by a remarkably precise script. Am a rationalist obviously so the parts where we're supposed to wonder how much of this could be true left me indifferent; they are however quite believable if one is so inclined, except for the knifing of the boy-friend.