hope in shadows

After the world has been all but destroyed humanity comes together to save the species from extension, making flying man made islands.The poor and week still living on the surface and the rich living on the islands, after one of them crashes leaving almost no survivors a boy named Tucker goes to investigate the crash and finds a girl and her pet dog. Together they will try and find another flying island and tell them what happened to the one she was on and that they should try and find out what happened, but can they find one let alone survive the barren wasteland called earth or will they end up like most of the unfortunate one's stuck on the surface... eaten a live?