The Fires Of Ares - Chronicles of the Collapse, #2

Nathan Smith had done what he'd been asked to do. He had found a place where his failing community could find food, water, shelter and everything that they were currently lacking. Returning to his community with the news, however, was not quite the triumphant homecoming he had envisaged. Internal politics, petty-mindedness and the presence of those who had reason to hate him all conspired to sour his return.
Others had plans for the community. Plans that didn't include him, or his friends. Nathan soon finds himself again plunged into a nightmare of violence from which he cannot escape. The only difference now is that the worst monsters he must face this time around are not at all alien in nature. They are his own kind.