When Sarah accidentally proposes to her girlfriend in Provincetown, the mixup turns their loving relationship into a minefield of marital exploration.

Three twenty-something couples, one gay, one lesbian, and one straight, travel to a beach house to enjoy the last days of summer, but what should be a fun and carefree weekend becomes an exploration of what it takes to sustain a healthy relationship.

Nick cannot stop obsessing over his ex-girlfriend, Tris, until Tris' friend Norah suddenly shows interest in him at a club. Thus begins an odd night filled with ups and downs as the two keep running into Tris and her new boyfriend while searching for Norah's drunken friend, Caroline, with help from Nick's band mates. As the night winds down, the two have to figure out what they want from each other.