Inconceivable

After a series of miscarriages, Dr Angela, the affluent and cultivated mother of a 4-year-old daughter and a supportive husband who adores her, seems to have everything in life. Everything, but a son. With this in mind, when Angela meets through a mutual friend the charming but cryptic Katie, a single mother of a little daughter who has recently fled an abusive marriage, unexpectedly, she will become indispensable: first by earning Angela's trust and friendship, and then, as a live-in nanny. But how well does Angela know Katie, the appealing stranger with the intense fixation?