Ruby lives in a camp for World War III survivors. Governed by an authoritarian Council, the humans are slowly catching their breath... Until the day the water supply from the forest is cut off! This ...means that something has happened to Ruby's granny, who is supposed to take care of the water pipes. Ruby leaves the camp to save her grandmother without the Council's permission, while a secret group is sent to appropriate the water supply and hunt down a new life form occupying the woods. But this time, nature won't stand for it and Ruby must choose sides.