Well you could use like a small town in between some mountains and a forest. Like the Appalachian trail. And the mental illness as fallen angels or rising demons. If you like this idea, build the two through how many you want from either a run in or a simple friendship. It's not in the play book but not many writers of this area write their characters who are mates meet in a diner. But that is my idea. If you have any other problems.