Evelyn's ocean vacation turns deadly when the liner founders and her ex-husband Hank lets his vicious mother shove Evelyn into open water. Washing ashore on an uncharted tropical island, Evelyn encounters the surviving clan, who promptly banish her to cater to Hank's manipulative mistress. Left with nothing on the deadly beach, Evelyn refuses to surrender to panic.
Teaming up with Hank's pragmatic elder brother Milo, Evelyn constructs a fortified camp and purifies water while the arrogant relatives consume toxic raw fish and provoke wild predators. As beasts encircle the shore and the mistress reveals her treacherous colors, Evelyn and Milo hold their ground. Evelyn must protect their sanctuary from desperate scavengers until maritime rescue cutters reach the island.
