During a party a tsunami hits the coast of California, and Denver and a handful of others escape death and are swept out to sea. Of course, one of her fellow castaways is none other than her ex-BFF, Abigail, who can barely stand the sight of her. Trapped on a small boat with the most popular kids in school and waiting to be rescued, Denver wonders what might kill her first, dehydration, sunstroke, or the girl she used to think of as a sister?