A strange, last-minute phone call convinces Mitch Traiger to change his career plans and come work for a Greenwich hedge fund after college, rather than a boring Midwestern engineering firm. The money is impossible to turn down - and so Mitch comes east, dragging his reluctant wife, Sara.Not long after starting the new job, he falls under the spell of a mentor, Turk Cain, who seems to have everything that a kid from the Midwest could dream of: a stunning house, a sailboat, an island retreat off the coast of Maine, and a beautiful, volatile wife. Everything about Turk Cain's life is perfect, and - to Mitch's delight - Turk is willing to share it all with Mitch - willing to share everything: his inside knowledge of office politics, his house in Maine, even his wife, Grace. It happens on a summer night, over a long booze-filled weekend, the two couples agree to a swap: The young innocent couple from the Midwest, the beautiful rich couple from Connecticut. Just one night. Just one time. What could go wrong? Only everything. When Mitch wakes the next morning, his world has been changed. Soon he finds himself in a trap, and the choices he has made seem worse than misguided and mistaken. They seem deadly.