Liv Travers never knew real friendship until she met fellow mums Beth and Binnie. The three women become inseparable as they muddle through early parenthood together. Then along comes Ange... Ambitious, wealthy and somehow able to do it all. Under Ange's guiding presence, the group finds new vigour and fresh aspirations - bigger houses, better schools, dinners at exclusive restaurants. But Liv can't keep up and is increasingly edged out. When the four families take a three-week trip to a luxurious holiday resort, Liv seizes the opportunity to reclaim her place at the heart of the group, only to discover the true, devastating cost of a friendship with Ange.