When a plane crash kills all but four of its passengers, the survivors are left stranded on a desert island. Gus, Marie and Ian are colleagues who were on their way to a conference, whilst the other is a lone teenage girl, Erin. After trying to send out a Mayday message through the radio, they are stunned to discover that a nuclear catastrophe has wiped out the entire civilised world. Now it's up to them to try and preserve the knowledge built up by centuries of human civilisation and to argue about which of the men gets to propagate the human race with the unfortunate Erin.