Three British couples meet around the pool on their Florida holiday and become fast friends. But on Easter Sunday, the last day of their vacation, tragedy strikes: the fourteen-year-old daughter of an American vacationer goes missing, and her body is later found floating in the mangroves. When the shocked couples return home to the U.K., they remain in contact, and over the course of three increasingly fraught dinner parties they come to know one another better. But they don't always like what they find. Buried beneath these apparently normal exteriors are some unusual kinks and unpleasant vices. Then a second girl goes missing, in Kent -- not far from where any of the couples lives. Could it be that one of these six has a secret far darker than anybody can imagine?