Lucy and Owen have taken the plunge, trading in their crazy life in a cramped apartment for Beekman, a bucolic Hudson Valley exurb. When friends at a wine-soaked dinner party reveal they've made their marriage open, sensible Lucy balks. There's a part of her, though, that's intrigued. Why not try a short marital experiment? Six months, clear ground rules, zero questions asked. When an affair with a man in the city begins to seem more enticing than the happily-ever-after she's known for the past nine years, Lucy must decide what truly makes her happy --- "real life" or the "experiment"?