Sophie, Emily, Amy and Melissa have been best friends since they met twenty years ago. As history has moved on around them, they have seen each other through everything. From Sophie's secret fear that she doesn't actually want to be a mother, despite having two kids, to Amy's perfect-on-the-outside-abusive-on-the inside marriage, to Melissa's spiralling alcoholism and Emily's single motherhood. But could a lie that spans just as long tear them apart?