Three couples meet on a Florida holiday and become friends. But on the last night, their holiday takes a tragic twist: the teenage daughter of another holidaymaker goes missing, and her body is found floating in the mangroves.
When the couples return home, they remain in contact. Over the course of three increasingly fraught dinner parties, they come to know each another better, but it turns out they don't always like what they find ...
Then a second girl goes missing. Could it be that one of them has a secret far darker than anybody can imagine?