Seven days. Three families. One killer. Whatever you do . . . DON'T LOOK DOWN It was supposed to be the perfect holiday - a group of families enjoying a week together in the sun. Four women who have been best friends for as long as they can remember - Kate, Rowan, Jennifer and Izzy - making the most of a luxurious villa in the south of France. But Kate has a secret: her husband is having an affair. And a week away might just be the perfect opportunity to get the proof she needs - to catch him in the act once and for all. Because she suspects the other woman is one of her two best friends. ...