After a shipwreck, retired soldier Jack and his girlfriend's stepmother Marcy are stranded on a deserted island. Initially hostile, they must cooperate to survive. When they join other survivors, camp leader Richard establishes a dictatorship and frames Jack and Marcy, getting them exiled. They build a new camp with followers including Mia. The arrival of escaped convicts Lucas and Ron brings catastrophe. Ultimately, Mia's self-sacrifice and external rescue lead to justice and survival.
