M. E. Thomas is a high-functioning non-criminal sociopath. She is charismatic, ambitious and successful. You would be charmed by her if you met her, might even be seduced by her. You would not realise that she is studying you to find your flaws, that she is ruthlessly manipulative, has no empathy and does not feel guilt or remorse. But she does like people - she likes to touch them, mould them and ruin them. She could be your friend or your boss. She could be you . . .