The human try to stop the plague but it infects most of the world population like Russia, South Africa, United Kingdom. The US army forces put bombs on Alaska to eradicate the population. But a few of them survived and transmitted from one country to another. But now, the nightwalkers are much evolve then they were. They can communicate with other nightwalkers and attack in hordes to destroy a place. It takes only a few mintes to destroy a whole country. Every time they attack a place, they releases nuclear clouds with a special device which is made by someone whose whereabouts are now unknown, causing the place fell into darkness which make it easy to roam in that place freely. Now, the rest of the uninfected country set up quarantine camp in the borders and raise the security in the camps and order them to capture those persons who are likely a suspect for those things, even the humans also.