Carrie is a successful TV producer in a high pressure job. She's talented, liked, and well-respected. She and her husband, Adrian, an award-winning screenwriter, decided years before that they didn't want children. But now, just as they're both at the pinnacle of their careers, she has discovered she is pregnant, and is shocked to find that she wants to keep the baby. But in a competitive industry where time off is seen as a sign of weakness, Carrie looks on the prospect of maternity leave with trepidation. Enter Emma, the temp, who is everything she could wish for as her cover: smart, willing and charming. Carrie fears that Emma is manoeuvring her way into Carrie's life, causing turmoil in both her marriage and her work as she does so. The problem is everyone else adores her... Increasingly isolated from Adrian and her colleagues, Carrie begins to believe Emma has an agenda, or is she just being paranoid? Does Emma want her job, or maybe she's after much more?