Doctors Miles and Grace Markell appear to be a perfect power couple. They run a couples therapy retreat in a luxurious resort in the Mayan Riviera where they help spouses deal with their marriage struggles. Johanna and Ben's relationship looks great on the outside, but in reality, they're deeply alienated from one another. Colin is a workaholic, and Shell always comes second, and they fight constantly. As both couples begin Harmony Resosrt's intensive therapy program, it becomes clear that Harmony is not all it seems--and neither are Miles and Grace. And when Miles goes missing and a powerful hurricane descends on the coast, everyone becomes a suspect.