Two sisters, one house, a lifetime of secrets... Each year, the Carew sisters embark on their yearly trip to the family holiday home, Atlantic House, set on a picturesque Cornish cliff. Prudence, the hard-nosed businesswoman, is married to the meek and mild Francis, but she's about to get a shock reminder that you should never take anything for granted. Constance, loving wife to philandering husband Greg, has always been outwitted by her manipulative sibling, but this year she's finally had enough. When an old face reappears on the scene, years of simmering resentments reach boiling point, but little do the women know that a long-buried secret is about to bite them all on the bottom. Is this one holiday that will push them all over the edge, or can Constance and Pru leave the past where it belongs?