The Cascadia Plan

Everyone in the world is gone. A government plot to save the world from a series of devastating natural disasters leaves just six people left to fend for themselves. These people are who the governments of the world have decided are the people most likely to survive these events, and pave the way for the rest of the world's population to return safely. What they don't realize is there's a mole on either side of the divide, and not only could it collapse the plot, but the entire world as we know it.