Due to increased climate change the sun melts the ice caps, causing an onslaught of never ending rain. As Fran Scott's town begins to disappear underwater and, after losing her parents in the chaos, she decides to seek out her sister June in Scotland. But as society begins to crumble around her, Fran must overcome a vast array of dangers, including disease, wild animals, marauding gangs of vicious thugs and most bizarre of all, the self-proclaimed King of Glasgow!