Sarah (Kate Potsworth Kate Bosworth), Abby (Katie Asselton Katie Aselton) and Louise (Rick Bell Lake Bell) are three good friends who have played together since childhood. In order to bridge the conflict between the other two, Sarah specially organized a holiday trip away from the hustle and bustle and annoyance of the city. They took a boat to a lonely island called Black Rock and went on a treasure tour. Along the way, there were laughter, quarrels and roars. After all, the inherent grievances in my heart could not be cleared away consciously. During this period, they encounter the man they met, Henry (Will Bouvier) and his hunting companions Drake (Jay Paulson) and Alex (Anslem Richardson). As night fell, three couples sat around the bonfire and chatted happily with each other. But as the primitive beast replaced human nature, everything took a sharp turn for the worse, and the killing suddenly came.