The beginning of the end

It all started in North America, or what used to be North America. The states and countries are gone, what's left are tiny islands that will soon be gone too. Lilly, James, Maddy, and travis must get off these islands before the islands them self are gone forever! The faith of humanity lies in the hands of the people that's left(not that many people). The only problem is a nasty plague hit the tiny islands after they formed. Which caused weird side effects on the few living people left in the world, in other words they became living zombies!