So I'm just at the stage now where I've lined up the big finale. Trouble is, I haven't a clue how to go about finishing it. Basic out line of the story is a post apocalyptic world. 5 survivors. One of the survivors is mentally unhinged and has been found out for working against the others. The obvious thing to do is to banish him, but my characters are questioning the decision. What's to stop him returning? It's not a book about killing, so blowing his head off isn't an option, so how can I get rid of him in a way that's exciting for the story, but also a realistic option to prevent him returning. The world is basically as you were save for everyone being dead. No power is the main difference, So don't think that Alians have invaded or a shower of.meteors have rained down on us.